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Navegação por autor "1045"
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COSTA, ROBSON S.
; MOURA, ESPERIDIANA A.B.
.
A bibliometric analysis of the strategy and performance measurement of the polymer matrix nanomaterials development scenario globally, and the participation of Brazil.
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 329-342,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_31
Abstract:
Extensive studies have been conducted worldwide on the strategy for the
development of nanomaterials. One of the known strategies for this has aroused
interest in the market is the incorporation of the nanoparticles, extracted from the
residues in thematrices of the polymers for the production of environmentally correct
nanocomposites. This work presents a survey of the scientific knowledge of nanomaterials
of the polymer matrix and a panoramic view of the evolution of these nanomaterials
are subject, in order to meet the criteria of sustainable development due to the
environmental concerns. This study also intends to use bibliometric tools to database
acquisition and analysis of bibliographic reviews for an evaluation of the scenarios
in the world on the development of polymeric nanomaterials based on three different
classes of polymeric nanocomposites: polymer/clay; polymer/graphene, and
polymer/nanocellulose nanocomposites.
Palavras-Chave:
statistical data;
nanomaterials;
nanocomposites;
scientific personnel;
knowledge management;
polymers
COSTA, ROBSON S.; MOURA, ESPERIDIANA A.B.
A bibliometric analysis of the strategy and performance measurement of the polymer matrix nanomaterials development scenario globally, and the participation of Brazil.
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 329-342.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_31.
Disponível em: http://repositorio.ipen.br/handle/123456789/31850. Acesso em: $DATA.
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SOARES, CARLOS
; SANTANA, JULYANA
; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
.
A comparison between graphene oxide and reduced graphene oxide as reinforcement agents in polypropylene nanocomposite using irradiated polypropylene as compatibilizer.
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 385-394,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_36
Abstract:
Graphene is thematerial with the bestmechanical resistance ever encountered.
Various types of studies have been carried out on possible applications. The use
as a reinforcement in nanocomposites has shown to be a promising field, but some
studies indicate that the graphene oxide (GO) and reduced graphene oxide (RGO)
have better results as reinforcement, due to the functional groups,which allowa better
adhesion with the matrix. This study analyzes the production of polypropylene (PP)
nanocomposite comparing the use of graphene oxide (GO) and reduced graphene
oxide (RGO) as fillers and irradiated polypropylene as a coupling agent.Atwin-screw
extruder and injection molding machine were used to produce the nanocomposite
PP reinforced with 0.2 wt% of GO and RGO by melt blending. The GO and RGO
were characterized byXRDanalysis.The nanocomposite sampleswere characterized
by XRD, SEM, TG, DSC and mechanical test.
Palavras-Chave:
graphene;
oxides;
polypropylene;
nanocomposites;
gamma radiation;
stresses;
tensile properties
SOARES, CARLOS; SANTANA, JULYANA; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
A comparison between graphene oxide and reduced graphene oxide as reinforcement agents in polypropylene nanocomposite using irradiated polypropylene as compatibilizer.
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 385-394.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_36.
Disponível em: http://repositorio.ipen.br/handle/123456789/31851. Acesso em: $DATA.
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ANDRADE, MARCIO S.
; ISHIKAWA, OTAVIO H.
; COSTA, ROBSON S.
; SEIXAS, MARCUS V.S.
; RODRIGUES, RITA C.L.B.; MOURA, ESPERIDIANA A.B.
.
Development of sustainable food packaging material based on biodegradable polymer reinforced with cellulose nanocrystals.
Food Packaging and Shelf Life,
v. 31,
p. 1-10,
2022.
DOI:
10.1016/j.fpsl.2021.100807
Abstract:
The increased environmental impact and sustainability issues related to conventional food packaging have gained attention and led to a global concern. The massive consumption of conventional food packaging has increased disposal of non-eco-friendly packaging waste, severely damaging the environment. The replacement by sustainable packaging is an important alternative to reduce the enormous volume of plastic waste. In this work, bionanocomposite films composed of PBAT/PLA blend and cellulose nanocrystals (CNCs) extracted from agro-waste were investigated. Characterization of CNCs confirmed that nanocrystals were obtained. Bionanocomposite films presented better hydrophobic character and thermal stability than the blend film. In addition, the tensile strength, elongation at break, and Young's modulus was around 52%, 29%, and 118%, respectively, higher than blend films. These mechanical values were comparable to values of commercial plastic materials that are extensively used in food packaging. Thus, the prepared bionanocomposite films might be an interesting alternative to produce sustainable food packaging materials.
Palavras-Chave:
cellulose;
nanocrystals;
food;
packaging;
nanocomposites;
sugar cane;
bagasse;
agricultural wastes
ANDRADE, MARCIO S.; ISHIKAWA, OTAVIO H.; COSTA, ROBSON S.; SEIXAS, MARCUS V.S.; RODRIGUES, RITA C.L.B.; MOURA, ESPERIDIANA A.B.
Development of sustainable food packaging material based on biodegradable polymer reinforced with cellulose nanocrystals.
Food Packaging and Shelf Life,
v. 31,
p. 1-10,
2022.
DOI:
10.1016/j.fpsl.2021.100807.
Disponível em: http://repositorio.ipen.br/handle/123456789/32970. Acesso em: $DATA.
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YATACO-LAZARO, LOURDES M.; GONZALEZ-RUIZ, JESUS; VIRGINIO, SUELI
; OLIVEIRA, RENE R.
; MAIA, WILSON S.; VALENZUELA-DIAZ, FRANCISCO; MOURA, ESPERIDIANA
.
Efecto morfológico y térmico de filmes flexibles de etilen vinil alcohol reforzados con óxido de grafeno / Morphological and thermal effects of ethylene vinyl alcohol film reinforced with graphene oxide.
Revista ECIPerú,
v. 12,
n. 2,
p. 5-9,
2015.
Abstract:
Se estudió los efectos morfológicos y térmicos de los filmes de EVOH reforzados con 0.1 y 0.5 wt. % de GO. El EVOH ha sido ampliamente usado en embalajes para alimentos porque preserva la calidad de los productos debido a su excelente desempeño de barrera de gas y su buena transparencia. El GO fue preparado vía oxidación química del grafito y fue exfoliado en nanoláminas usando el método sonoquímico. Los filmes fueron preparados por extrusión en estado fundido y extrusión por soplado, luego fueron caracterizados por análisis de XRD, TG y SEM, la correlación entre sus propiedades fue discutida.
Palavras-Chave:
films;
temperature dependence;
ethylene;
alcohols;
packaging;
food;
graphene;
oxides;
mechanical properties
YATACO-LAZARO, LOURDES M.; GONZALEZ-RUIZ, JESUS; VIRGINIO, SUELI; OLIVEIRA, RENE R.; MAIA, WILSON S.; VALENZUELA-DIAZ, FRANCISCO; MOURA, ESPERIDIANA.
Efecto morfológico y térmico de filmes flexibles de etilen vinil alcohol reforzados con óxido de grafeno.
Revista ECIPerú,
v. 12,
n. 2,
p. 5-9,
2015.
Disponível em: http://repositorio.ipen.br/handle/123456789/31149. Acesso em: $DATA.
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BARROS, JANETTY J.P.
; OLIVEIRA, RENE R.
; LUNA, CARLOS B.B.; WELLEN, RENATE M.R.; MOURA, ESPERIDIANA A.B.
.
Effectiveness of modified lignin on poly(butylene adipateco-terephthalate)/poly(lactic acid) mulch film performance.
Journal of Applied Polymer Science,
v. 140,
n. 46,
p. 1-12,
2023.
DOI:
10.1002/app.54684
Abstract:
In this work, the biodegradable poly(butylene adipate-co-terephthalate) (PBAT)/
poly(lactic acid) (PLA) blend (ECOVIO®) and lignin, a renewable and biodegradable natural polymer with high UV absorption and modified by gamma
radiation were used to produce agriculture mulch films. Lignin was gammairradiated at 30 and 60 kGy. The irradiated and non-irradiated lignin content of
2 wt% was incorporated into PBAT/PLA blend matrix using a twin-screw
extruder and extrusion blown film to prepare flexible films. PBAT/PLA/LIGNIN
films were characterized by Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), x-ray diffraction (XRD), field emission
scanning electron microscopy (FESEM), tensile tests, contact angle, and UV–Vis
analysis. FTIR spectra showed partial miscibility between PBAT/PLA and lignin,
being intensified in irradiated lignin compounds. The DSC and XRD results
confirmed that the degree of crystallinity of the blends was not significantly
influenced by lignin addition. FE-SEM images showed better dispersion and miscibility in PBAT/PLA/Irradiated lignin. Miscibility improvement provided by
irradiated lignin promoted better mechanical properties, mainly with lignin irradiated at 60 kGy. PBAT/PLA/LIGNIN films containing 2 wt% showed excellent
UV-barrier property and greater hydrophobicity. Summing up, incorporation of
low contents of irradiated lignin could be an interesting alternative to produce
biodegradable UV-blocking agriculture mulch films.
BARROS, JANETTY J.P.; OLIVEIRA, RENE R.; LUNA, CARLOS B.B.; WELLEN, RENATE M.R.; MOURA, ESPERIDIANA A.B.
Effectiveness of modified lignin on poly(butylene adipateco-terephthalate)/poly(lactic acid) mulch film performance.
Journal of Applied Polymer Science,
v. 140,
n. 46,
p. 1-12,
2023.
DOI:
10.1002/app.54684.
Disponível em: http://repositorio.ipen.br/handle/123456789/34249. Acesso em: $DATA.
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BARROS, JANETTY J.P.
; SOARES, CARLOS P.
; MOURA, ESPERIDIANA A.B. de
; WELLEN, RENATE M.R..
Enhanced miscibility of PBAT/PLA/lignin upon γ-irradiation and effects on the non-isothermal crystallization.
Journal of Applied Polymer Science,
v. 139,
n. 45,
p. 1-18,
2022.
DOI:
10.1002/app.53124
Abstract:
Lignin is natural and renewable polymer, the second most abundant on Earth. Properly used it can reduce synthetic and oil based materials in addition to contributing to the biodegradable systems. In this work, the kraft lignin was subjected to gamma radiation at absorbed doses of 30, 60, and 90 KGy in order to increase the interaction with “Poly(butylene adipate-co-terephthalate) (PBAT)/Poly(lactic acid) (PLA)” blend (Ecovio®). PBAT/PLA/lignin blends with 10% of the weight of lignin were produced by extrusion using twin-screw extruder and characterized by Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), and Field emission scanning electron microscopy (FE-SEM). FTIR spectra showed partial miscibility between PBAT/PLA and lignin, most due to the hydrogen bond between PBAT/PLA carbonyl and lignin hydroxyl, being intensified in irradiated lignin compounds. As evidenced on DSC scans, in PBAT/PLA/irradiated lignin the crystallization peak was shifted to lower temperatures and the crystallization rate decreased. Crystallization kinetics was modeled using Pseudo Avrami, and isoconversional models of Friedman and Vyazovkin. Pseudo-Avrami displayed linearity deviation at beginning and crystallization ending due to the nucleation and secondary crystallization, while from Friedman and Vyazovkin the activation energy (Ea) was higher for PBAT/PLA/irradiated lignin 30 KGy, characterizing crystallization with higher energy consumption. FE-SEM images showed better dispersion and miscibility in PBAT/PLA/irradiated lignin. The results indicate that the irradiation of Kraft lignin promotes miscibility and compatibility of PBAT/PLA/lignin.
Palavras-Chave:
crystallization;
polymers;
calorimetry;
irradiation;
kinetics
BARROS, JANETTY J.P.; SOARES, CARLOS P.; MOURA, ESPERIDIANA A.B. de; WELLEN, RENATE M.R.
Enhanced miscibility of PBAT/PLA/lignin upon γ-irradiation and effects on the non-isothermal crystallization.
Journal of Applied Polymer Science,
v. 139,
n. 45,
p. 1-18,
2022.
DOI:
10.1002/app.53124.
Disponível em: http://repositorio.ipen.br/handle/123456789/33423. Acesso em: $DATA.
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MOURA, E.A.
; SANTOS, B.S.
; ISHIKAWA, O.
; SANTANA, J.G.
; BARTOLOMEI, M.R.
; OLIVEIRA, R.R.
.
Graphene oxide nanosheets as fillers for thermoplastic-matrix nanocomposites.
In: PAN-AMERICAN NANOTECHNOLOGY CONFERENCE, 2nd,
March 4-7, 2020,
Águas de Lindoia, SP.
Abstract...
2020.
Abstract:
Recent studies have shown that the synthesis of graphene oxide (GO) by chemical oxidation of graphite followed by its reduction is one's the most promising routes to prepare remarkable polymer/graphene nanocomposite materials with significant improvement of properties compared to the base polymer. The addition of a very small amount of reduced graphene oxide (RGO)in a polymer can enhance its properties, with respect to electrical conductivity, barrier resistance, stiffness, abrasion resistance, mechanical resistance, and fire retardancy. Numerous approaches have been established to prepare RGO from the desoxygenation of GO. This work presents the synthesis of graphene oxide by chemical oxidation of graphite followed by its photoreduction in aqueous dispersion using UV radiation and highlights some examples of RGO/thermoplastic-matrix nanocomposites prepared by melt processing. To evaluate the potential application of thermoplastic composites prepared, the RGO's content on the morphological, mechanical and thermal properties of the as-obtained nanocomposites has been assessed. In addition, GO/RGO nanosheets were characterized by ATR–FTIR, XRD, Raman, and FE-SEM. According to the results, it can be inferred that the addition of RGO leads to a remarkable improvement in the performance of thermoplastic-matrix nanocomposites and offers a competitive solution for various potential applications.
MOURA, E.A.; SANTOS, B.S.; ISHIKAWA, O.; SANTANA, J.G.; BARTOLOMEI, M.R.; OLIVEIRA, R.R.
Graphene oxide nanosheets as fillers for thermoplastic-matrix nanocomposites.
In:
PAN-AMERICAN NANOTECHNOLOGY CONFERENCE, 2nd,
March 4-7, 2020,
Águas de Lindoia, SP.
Abstract...
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/31886. Acesso em: $DATA.
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TATEI, TATIANE Y.
; FONTES, ERIC H.
; MOREIRA, RENAN P.
; DIAS, FRANCISCO V.; OLIVEIRA, RENE R.
; RANGARI, VIJAYA; MOURA, ESPERIDIANA A.B.
.
Improvement properties of polypropylene by graphene oxide incorporation.
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 581-589,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_57
Abstract:
Due to the remarkable properties of graphene oxide (GO) and its possibility
of functionalization,GOhas been used in many applications such as nanocomposites.
GO nanosheets have been shown to improve the properties of the polypropylene
(PP) matrix, for instance, its strength, gas barrier, thermal, and electrical conductivity.
As PP has relatively low cost and varied applications, this work aims to study the
changes in its thermal, morphological, and mechanical properties, due to the incorporation
of GO in the PP matrix. GO was synthesized from graphite by a modified
Hummers method. The nanocomposites PP/GO with 0.1, 0.2, and 0.3 wt% of GO in
the PP matrix were obtained using a twin-screw extruder and an injection molding
machine via a melt blending process. The nanocomposites PP/GO were characterized
by FE-SEM and Izod impact test. In addition, the GO nanosheets were also
characterized by Raman spectroscopy, ATR-FTIR, FE-SEM, and XRD, therewith
correlation between properties was discussed.
Palavras-Chave:
graphene;
oxides;
polypropylene;
nanocomposites
TATEI, TATIANE Y.; FONTES, ERIC H.; MOREIRA, RENAN P.; DIAS, FRANCISCO V.; OLIVEIRA, RENE R.; RANGARI, VIJAYA; MOURA, ESPERIDIANA A.B.
Improvement properties of polypropylene by graphene oxide incorporation.
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 581-589.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_57.
Disponível em: http://repositorio.ipen.br/handle/123456789/31854. Acesso em: $DATA.
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COLOMBO, MARIA A.S.
; DIAZ, FRANCISCO R.V.; KODALI, DEEPA; RANGARI, VIJAYA; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
.
Influence of reinforcing efficiency of clay on the mechanical properties of poly(butylene terephthalate) nanocomposite.
Ceramics,
v. 6,
n. 1,
p. 58-73,
2023.
DOI:
10.3390/ceramics6010005
Abstract:
In contrast to traditional fillers, clay, in particular, natural smectite clay, represents an environmentally significant alternative to improve the properties of polymers. Compared to conventional
nanofillers, smectite clay can effectively enhance the physical and mechanical properties of polymer
nanocomposites with a relatively small amount of addition (<5 wt%). The present study focuses
on investigating the reinforcing efficiency of different amounts (up to 5 wt%) of a natural Brazilian
smectite clay modified (MBClay) on the mechanical properties of poly(butylene terephthalate) (PBT)
nanocomposites and also evaluates the correlation between MBClay addition and the mechanical
and thermal behaviors of the PBT/MBClay nanocomposites. Natural Brazilian clay modified by
the addition of quaternary salt and sodium carbonate (MBClay) was infused into the PBT polymer
by melt extrusion using a twin-screw extruder. It was found that the best properties for PBT were
obtained at 3.7 wt% of modified BClay. Tensile strength at break exhibited increased by about 60%,
flexural strength increased by 24%, and flexural modulus increased by 17%. In addition, an increase in
the crystallinity percentage of PBT/BClay nanocomposite was confirmed by DSC and XRD analysis,
and a gain of about 45% in HDT was successfully achieved due to the incorporation of 3.7 wt%
of MBClay
Palavras-Chave:
nanocomposites;
clays;
polymers;
matrix materials;
mechanical properties;
morphology
COLOMBO, MARIA A.S.; DIAZ, FRANCISCO R.V.; KODALI, DEEPA; RANGARI, VIJAYA; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
Influence of reinforcing efficiency of clay on the mechanical properties of poly(butylene terephthalate) nanocomposite.
Ceramics,
v. 6,
n. 1,
p. 58-73,
2023.
DOI:
10.3390/ceramics6010005.
Disponível em: http://repositorio.ipen.br/handle/123456789/34074. Acesso em: $DATA.
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SANTOS, BIANCA S.
; INACIO, ANDRE L.N.
; BARTOLOMEI, SUELLEN S.
; SILVA, TAISE B.S.
; CARMO, KARINA L.S.
; OLIVEIRA, RENE R.
; MOURA, ESPERIDIANA A.B.
.
Influence of the reduced graphene oxide incorporation on properties of acrylonitrile butadiene styrene (ABS).
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 599-607,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_59
Abstract:
The purpose of this study was to evaluate the influence of incorporation of
the reduced graphene oxide on properties of acrylonitrile butadiene styrene (ABS).
The incorporation of 0.5 and 1.5 wt% of RGO into ABS matrix was carried out
by melting extrusion process using a twin-screw extruder and injection molding
machine. The properties of ABS/RGO nanocomposite samples were investigated
by tensile and impact Izod tests, FE-SEM, and XRD analysis. The results showed
that the incorporation of small amount of RGO into ABS matrix led to obtaining of
polymeric nanocomposite with superior mechanical properties when compared with
original properties of ABS matrix.
Palavras-Chave:
graphene;
oxides;
acrylonitrile;
butadiene;
styrene;
mechanical tests
SANTOS, BIANCA S.; INACIO, ANDRE L.N.; BARTOLOMEI, SUELLEN S.; SILVA, TAISE B.S.; CARMO, KARINA L.S.; OLIVEIRA, RENE R.; MOURA, ESPERIDIANA A.B.
Influence of the reduced graphene oxide incorporation on properties of acrylonitrile butadiene styrene (ABS).
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 599-607.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_59.
Disponível em: http://repositorio.ipen.br/handle/123456789/31855. Acesso em: $DATA.
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BARTOLOMEI, S.S.; MOURA, E.A.B.
; WIEBECK, H..
Inhibition of flame propagation in nanocomposites with expanded polystyrene recycled clay, gypsum, and titanium dioxide.
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 609-618,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_60
Abstract:
The large amount of plastic waste found in the environment, landfills, and
dumps boost research into the recycling of polymer materials, which could reduce
the amount of polymer discarded. In Brazil, the sector that most consumes polymers
is the civil construction that could consume recycled polymerswithout concerns with
the properties due to applications of low mechanical exigency. However, for applications
in this sector, it is necessary that the materials have some resistance to the
propagation of flames. This work discusses the flame retardance in nanocomposites
with recycled polystyrene matrix and particles of nanoargila, titanium dioxide, and
gypsum. The results of the X-ray diffraction (XRD), differential scanning calorimeter
(DSC), field emission scanning electronmicroscopy (FE-SEM), and flammability
test. The results showed that glycerol, added during recycling, can plasticize recycled
expanded polystyrene while maintaining the flame resistance properties of the
material with flame retardant. It can also be concluded that some particles may delay
the propagation of the flame in the composite.
Palavras-Chave:
clays;
titanium oxides;
gypsum;
polystyrene;
flames
BARTOLOMEI, S.S.; MOURA, E.A.B.; WIEBECK, H.
Inhibition of flame propagation in nanocomposites with expanded polystyrene recycled clay, gypsum, and titanium dioxide.
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 609-618.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_60.
Disponível em: http://repositorio.ipen.br/handle/123456789/31856. Acesso em: $DATA.
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BARTOLOMEI, SUELLEN S.
; SANTANA, JULYANA G.
; DIAZ, FRANCISCO R.V.; KAVAKLI, PINAR A.; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
.
Investigation of the effect of titanium dioxide and clay grafted with glycidyl methacrylate by gamma radiation on the properties of EVA flexible films.
Radiation Physics and Chemistry,
v. 169,
p. 1-9,
2020.
DOI:
10.1016/j.radphyschem.2018.08.022
Abstract:
Many studies report that nanocomposites obtained by dispersion of a small amount nanofiller into the polymer
have remarkable improvements achieved in the mechanical and physical properties. However, in order to
achieve this great improvement in properties, it is necessary that the nanofillers be dispersed homogeneously
into the polymeric matrix. Often this dispersion is difficult to achieve due to the high interfacial energy of the
nanoparticles present. This study reports the effect of gamma irradiation induced graft of glycidyl methacrylate
(GMA) onto the surface of TiO2 and Clay nanofillers to improve their dispersion into the EVA matrix. The
physical and mechanical properties of Ethylene-vinyl acetate copolymer (EVA) flexible films with these nanoparticles
were studied. EVA nanocomposite with adding of the different amount of TiO2 and modified montmorillonite
clay grafted and un-grafted with glycidyl methacrylate (GMA) using gamma irradiation have been
prepared by melt extrusion. The nanocomposite flexible films were produced using a flat die extrusion process.
The PGMA-grafted nanofillers were characterized by XRD and TEM analysis. The flexible films were characterized
by Tensile tests, ATR–FTIR, UV–VIS, XRD, TG, and FE-SEM analysis to understand the nature of the
interaction between the nanofillers and EVA matrix. The results showed that the addition of PGMA-grafted TiO2
and Clay nanofillers into EVA matrix improved the bonding between the nanofillers and matrix. It was also found
that the PGMA-grafted nanofillers could be well dispersed into an EVA matrix in contrast to that of un-grafted.
The tensile strength and modulus of the resulting EVA/TiO2-PGMA enhanced in comparison to that of un-grafted
TiO2. The EVA/Clay-PGMA had slightly decreased tensile strength comparable to that of EVA/Clay but had
considerably improved elastic modulus. In addition, the flexible films based on TiO2 exhibited high UV–Vis light
absorption with energy gap shifted to the visible region. The results demonstrated that TiO2 and Clay nanofillers
grafted with GMA by gamma radiation can be used to prepare EVA flexible films with improved bonding between
the nanofillers and matrix and, consequently, enhanced properties for food and cosmetic packaging application.
Palavras-Chave:
dispersions;
films;
gamma radiation;
irradiation;
methacrylates;
nanocomposites;
physical properties;
polymerization;
titanium oxides;
x-ray diffraction
BARTOLOMEI, SUELLEN S.; SANTANA, JULYANA G.; DIAZ, FRANCISCO R.V.; KAVAKLI, PINAR A.; GUVEN, OLGUN; MOURA, ESPERIDIANA A.B.
Investigation of the effect of titanium dioxide and clay grafted with glycidyl methacrylate by gamma radiation on the properties of EVA flexible films.
Radiation Physics and Chemistry,
v. 169,
p. 1-9,
2020.
DOI:
10.1016/j.radphyschem.2018.08.022.
Disponível em: http://repositorio.ipen.br/handle/123456789/31073. Acesso em: $DATA.
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BARTOLOMEI, MARCIO R.X.
; CARMO, KARINA H.S.
; SANTOS, BIANCA S.
; BARTOLOMEI, SUELLEN S.
; OLIVEIRA, RENE R.
; MOURA, ESPERIDIANA A.B.
.
Investigation on mechanical and thermal behaviours of PBAT/PLA blend reinforced with reduced graphene oxide nanosheets.
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 631-639,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_62
Abstract:
The aim of this study was to process and investigate the changes in
the mechanical and morphological properties of the biodegradable nanocomposites
based on polybutylene adipate-co-terephthalate (PBAT)/poly(lactic acid) (PLA)
blend (PBAT/PLA blend) due to the incorporation of reduced graphene oxide (RGO)
nanosheets. The biodegradable polymeric nanocomposites were prepared by melting
extrusion process using a twin-screw extruder machine. The influence of the RGO
nanosheets incorporation on mechanical and thermal properties of PBAT/PLA blend
was investigated by tensile Thermogravimetric (TG), X-Ray diffraction (XRD), differential
scanning calorimetry (DSC), and tensile test analysis. Results showed that
incorporation of the small amount ofRGO(0.1wt.%) ofRGOnanosheets in the blend
matrix of PBAT/PLA resulted in an important gain of mechanical properties of the
blend. This result indicates that a very small amount of RGO nanosheets addition in
the PBAT/PLA can lead to obtaining materials with superior properties suitable for
several industrial applications.
Palavras-Chave:
polymers;
graphene;
oxides;
biodegradation;
mechanical tests
BARTOLOMEI, MARCIO R.X.; CARMO, KARINA H.S.; SANTOS, BIANCA S.; BARTOLOMEI, SUELLEN S.; OLIVEIRA, RENE R.; MOURA, ESPERIDIANA A.B.
Investigation on mechanical and thermal behaviours of PBAT/PLA blend reinforced with reduced graphene oxide nanosheets.
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 631-639.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_62.
Disponível em: http://repositorio.ipen.br/handle/123456789/31857. Acesso em: $DATA.
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CHIAPPERO, LUCIO R.; BARTOLOMEI, SUELLEN S.
; ESTENOZ, DIANA A.; MOURA, ESPERIDIANA A.B.
; NICOLAU, VERONICA V..
Lignin‑based polyethylene films with enhanced thermal, opacity and biodegradability properties for agricultural mulch applications.
Journal of Polymers and the Environment,
v. 29,
p. 450-459,
2021.
DOI:
10.1007/s10924-020-01886-6
Abstract:
Lignins are promising alternative raw materials for biocomposites due to their renewability, low cost and abundance. In this
work, the use of (softwood and hardwood) Kraft lignins in the development of LLDPE/lignin films for agricultural mulch
applications is studied. Processable blends were obtained from unmodified softwood lignin (SW) and from hardwood lignin
modified by esterification (HWE). LLDPE was pelletized with (2.5%, 5% and 10%) lignin with particle size between 38 and
75 μm and flexible films were blown extruded. Processable extrusion blends showed temperature differences lower than
20 °C between the Tg of lignin and the melting temperature of LLPDE. Films from neat LLPDE and with 2.5% of HWE and
up to 5% SW exhibited statistically comparable (≅ 349%) values of ductility. Ester groups present in lignin improve weight
loss of lignin-based blends after soil buried test.
Palavras-Chave:
polyethylenes;
agriculture;
films;
lignin;
composite materials;
extrusion;
biodegradation
CHIAPPERO, LUCIO R.; BARTOLOMEI, SUELLEN S.; ESTENOZ, DIANA A.; MOURA, ESPERIDIANA A.B.; NICOLAU, VERONICA V.
Lignin‑based polyethylene films with enhanced thermal, opacity and biodegradability properties for agricultural mulch applications.
Journal of Polymers and the Environment,
v. 29,
p. 450-459,
2021.
DOI:
10.1007/s10924-020-01886-6.
Disponível em: http://200.136.52.105/handle/123456789/31774. Acesso em: $DATA.
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TAMURA, CAROLINE S.
; ARANTES, MARIANA
; CARMO, KARINA H.S.
; SANTOS, BIANCA S.
; OLIVEIRA, RENE R.
; MOURA, ESPERIDIANA A.B.
.
Mechanical and morphological properties of hybrid composites based on recycled LDPE/EVA blend reinforced with clay and babassu fiber residues.
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 661-669,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_65
Abstract:
Over the years the consumption of plastic products made of conventional
polymers has produced a large amount of waste which has led to disposal problems
worldwide. Among the alternatives to minimize these problems are reuse and recycling
practices. Then, the recycling of plastic and the use of recycled materials to
produce new materials reinforced with nanoparticles from natural resources can be
an alternative to reduce inappropriate waste disposal. The objective of this study is to
investigate the effects of the addition of clay and non-treated babassu fiber residues
on the mechanical and morphological properties of composite based on recycled
LDPE/EVA blend. Composite materials containing 1–3 wt% of babassu residues
and 1 wt% of clay were prepared using a twin-screw extruder machine and flat die
single extrusion process, in order to prepare hybrid composites sheets. The sheets
prepared by recycled LDPE/EVA blend and its composites were characterized by
tensile tests, XRD, and FE-SEM analysis and the correlation between properties was
discussed.
Palavras-Chave:
mixers;
recycling;
polymers;
films;
fibers;
composite materials;
hybridization
TAMURA, CAROLINE S.; ARANTES, MARIANA; CARMO, KARINA H.S.; SANTOS, BIANCA S.; OLIVEIRA, RENE R.; MOURA, ESPERIDIANA A.B.
Mechanical and morphological properties of hybrid composites based on recycled LDPE/EVA blend reinforced with clay and babassu fiber residues.
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 661-669.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_65.
Disponível em: http://repositorio.ipen.br/handle/123456789/31858. Acesso em: $DATA.
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KODALI, DEEPA; UDDIN, MD-JAMAL; MOURA, ESPERIDIANA A.B.
; RANGARI, VIJAK K..
Mechanical and thermal properties of modified Georgian and Brazilian clay infused biobased epoxy nanocomposites.
Materials Chemistry and Physics,
v. 257,
2021.
DOI:
10.1016/j.matchemphys.2020.123821
Abstract:
This study focuses on the preparation and characterization of nanocomposite system with bio-based epoxy resin (Super SAP 100/1000, contains 37% bio-based carbon content) and natural clays including Georgian clay and Brazilian clay. Georgian clay was surface modified using an ultrasound processing in presence of Decalin. Brazilian clay was modified to organophilic bentonite using quaternary ammonium salts. The resulting nano clay particles were characterized using XRD and TEM to confirm the particle size reduction and uniform distribution. The as-fabricated nanocomposites were characterized using flexure, DMA, TMA and TGA. The flexure analysis showed that the modified clay composites have significant improvement in strength (23–38%) and modulus (28–37%). Delayed thermal degradation was observed from TGA analysis which showed that the major degradation temperatures improved from 7°-25°C. DMA and TMA analysis showed improvements in storage moduli (4–6%) and coefficient of thermal expansion (CTE) (6–64%), respectively. The notable improvement in thermal and mechanical properties suggested the effective dispersion and the high degree of polymer particle interaction. The bio based content present in the Super Sap 100/1000 acts as plasticizer resulting in the extensive ductility of the polymer.
Palavras-Chave:
nanocomposites;
epoxides;
clays;
mechanical properties;
thermal degradation;
bentonite;
thermomechanical treatments;
differential thermal analysis;
calorimetry
KODALI, DEEPA; UDDIN, MD-JAMAL; MOURA, ESPERIDIANA A.B.; RANGARI, VIJAK K.
Mechanical and thermal properties of modified Georgian and Brazilian clay infused biobased epoxy nanocomposites.
Materials Chemistry and Physics,
v. 257,
2021.
DOI:
10.1016/j.matchemphys.2020.123821.
Disponível em: http://200.136.52.105/handle/123456789/31620. Acesso em: $DATA.
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FRANCISCO, DANAE L.
; PAIVA, LUCILENE B.; ALDEIA, WAGNER; LUGAO, ADEMAR B.
; MOURA, ESPERIDIANA A.B.
.
Noncovalently functionalized halloysite nanotubes for use in reinforced polymer composites.
ACS Applied Nano Materials,
v. 3,
n. 11,
p. 11510-11516,
2020.
DOI:
10.1021/acsanm.0c02600
Abstract:
The inorganic halloysite nanotube (HNT) is a promising type of
naturally occurring fillers with many important uses in different fields. An HNT
has a relatively low content of hydroxyl groups on its surface, which makes it
relatively hydrophobic, although this is not always sufficient to guarantee good
interfacial adhesion in composite systems. Further surface treatment is required to
improve the compatibility of HNTs with polymer matrixes, maximizing interfacial
interactions. The aim of the present work was to study a noncovalent
functionalization of halloysite with 2,2′-(1,2-ethenediyldi-4,1-phenylene) bisbenzoxazole
(EPB), based on electron transfer, for further use of EPB as a coupling
agent in polymer/HNT compatibility. A set of characterization techniques were
performed to evaluate the chemical and physical properties and evidence the
functionalization. The results revealed the surface modification of halloysite upon
functionalization. Emphasis was for powder wettability by tensiometry based on
Washburn because no studies about halloysite powders using this technique could
be found in the literature. The results demonstrate a reduction in the total surface energy of the system, usually accompanied by a
reduction in the polar component upon HNT modification.
Palavras-Chave:
nanotubes;
inorganic polymers;
electron transfer;
benzoxazoles;
thermal gravimetric analysis;
specific surface area
FRANCISCO, DANAE L.; PAIVA, LUCILENE B.; ALDEIA, WAGNER; LUGAO, ADEMAR B.; MOURA, ESPERIDIANA A.B.
Noncovalently functionalized halloysite nanotubes for use in reinforced polymer composites.
ACS Applied Nano Materials,
v. 3,
n. 11,
p. 11510-11516,
2020.
DOI:
10.1021/acsanm.0c02600.
Disponível em: http://repositorio.ipen.br/handle/123456789/31822. Acesso em: $DATA.
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COSTA, ROBSON S.
; ARAUJO, DANIELLE G.
; ANDRADE, MARCIO S. de
; OLIVEIRA, RENE R.
; RANGARI, VIJAYA; MOURA, ESPERIDIANA A.B.
; DIAS, FRANCISCO V..
Production and characterization of PBAT reinforced with clay and graphene oxide nanosheets: a comparative study.
In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 689-699,
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_68
Abstract:
The poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable
polymer, is among the most promising materials to be considered as environmentally
friendly high performance biodegradable plastics. However, the mechanical
properties of PBAT are not the best for several applications. According to the literature,
the properties of the biodegradable polymer can be improved by addition
of a small amount of nanofillers, such as clay, silica, and graphene. The objective
of this study is to compare the effect of the addition of Cloisite clay and graphene
oxide (GO) on the properties of flexible films based on PBAT matrix. The composite
films based on PBAT with addition of Cloisite (2.0 wt%) and PBAT composite films
with addition of Cloisite and GO (0.1–0.2 wt%) were prepared by extrusion, using
a twin-screw extruder and a flat die single extruder. The effects of the addition of
Cloisite clay and graphene oxide on mechanical and thermal properties of films were
evaluated by mechanical and water absorption tests, FE-SEM, XRD, and Raman
analysis.
Palavras-Chave:
graphene;
oxide minerals;
nanocomposites;
polymers;
butenes;
biodegradation;
mechanical properties;
flexibility
COSTA, ROBSON S.; ARAUJO, DANIELLE G.; ANDRADE, MARCIO S. de; OLIVEIRA, RENE R.; RANGARI, VIJAYA; MOURA, ESPERIDIANA A.B.; DIAS, FRANCISCO V.
Production and characterization of PBAT reinforced with clay and graphene oxide nanosheets: a comparative study.
In:
LI, JIAN (ed.); ZHANG, MINGMING (ed.); LI, BOWEN (ed.); MONTEIRO, SERGIO N. (ed.); IKHMAYIES, SHADIA (ed.); KALAY, YUNUS E. (ed.); HWANG, JIANN-YANG (ed.); ESCOBEDO-DIAZ, JUAN P. (ed.); CARPENTER, JOHN S. (ed.); BROWN, ANDREW D. (ed.).
Characterization of Minerals, Metals, and Materials.
Cham, CZ, Switzerland: Springer Nature Switzerland AG,
2020.
p. 689-699.
(The Minerals, Metals & Materials Series).
DOI:
10.1007/978-3-030-36628-5_68.
Disponível em: http://repositorio.ipen.br/handle/123456789/31860. Acesso em: $DATA.
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BARTOLOMEI, SUELLEN S.; SILVA, FELIPE L.F. da; MOURA, ESPERIDIANA A.B. de
; WIEBECK, HELIO.
Recycling expanded polystyrene with a biodegradable solvent to manufacture 3D printed prototypes and finishing materials for construction.
Journal of Polymers and the Environment,
v. 30,
n. 9,
p. 3701-3717,
2022.
DOI:
10.1007/s10924-022-02465-7
Abstract:
The amount of plastic waste generated is causing damage to the environment, such as sea and soil pollution, and one of the
alternatives for disposing of polymers is recycling. This work proposes recycling expanded polystyrene using a biodegradable
solvent, its plastification with glycerol, and the preparation of the composite with post-consumer recycled gypsum for
applications to manufacturing by 3D printing and for finishing materials for construction. Specimen for tensile testing and
shore D hardness were prepared by injection process and by 3D printing. In addition, Thermogravimetric (TG), Fourier-transform
infrared spectrometry (FTIR), Differential scanning calorimeter, Scanning electron microscope (FESEM) analyses,
and flame propagation tests were also carried out. TG and FTIR analyses show that the recycling process did not degrade the
material, and the addition of glycerol and gypsum improved the thermal stability of the composite. The mechanical properties
of the injected and 3D printed samples with gypsum were similar, due to the dimensional stability of the manufactured
filament, which improved the speed and quality of the specimen printing. The increase in ductility and the reduction in the
glass transition temperature showed that the recycled expanded polystyrene (RPS) were effectively plasticized with the
addition of 2 wt% glycerol, preserving their flame self-extinguishment when subjected to the flame propagation test. Due
to these properties, the plasticized RPS can be used to manufacture articles for finishing in civil construction, and the RPS
composite can be used to manufacture 3D printed prototypes.
Palavras-Chave:
3d printing;
recycling;
composite materials;
gypsum;
polystyrene
BARTOLOMEI, SUELLEN S.; SILVA, FELIPE L.F. da; MOURA, ESPERIDIANA A.B. de; WIEBECK, HELIO.
Recycling expanded polystyrene with a biodegradable solvent to manufacture 3D printed prototypes and finishing materials for construction.
Journal of Polymers and the Environment,
v. 30,
n. 9,
p. 3701-3717,
2022.
DOI:
10.1007/s10924-022-02465-7.
Disponível em: http://repositorio.ipen.br/handle/123456789/33227. Acesso em: $DATA.
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JOSE, ALVARO H.M.; MOURA, ESPERIDIANA A.B.
; RODRIGUES JUNIOR, DURVAL; KLEINGESINDS, EDUARDO K.; RODRIGUES, RITA C.L.B..
A residue-free and effective corncob extrusion pretreatment for the enhancement of high solids loading enzymatic hydrolysis to produce sugars.
Industrial Crops and Products,
v. 188,
n. Part B,
p. 1-11,
2022.
DOI:
10.1016/j.indcrop.2022.115655
Abstract:
To convert biomass into biofuel, pretreatment is the first stage required to de-structure lignocellulose – twin-screw extrusion is one of the viable pretreatment technologies. The enzymatic hydrolysis of corncobs pretreated with twin-screw extrusion to obtain sugar was evaluated. Corncob extrusion (115–130 °C; 14 rpm) was enhanced through the employment of additives (water and glycerol, 25:25, % w/w). By reproducing the response surface methodology (RSM) technique, the maximized glucose productivity (0.69 g L−1 h−1) and conversion of cellulose to glucose (90.4 % w/w), as well as hemicellulose to xylose and arabinose (44.0 % w/w) were established with the dosage of the commercial enzymatic complex Cellic Ctec2 (32 FPU/gdry lignocellulosic material) and solids loading (17.8 % w/w). Total sugar yield was of 471 kg (glucose 323 kg; xylose and arabinose 148 kg) for a dried corncob ton. Kinetic constants of the Michaelis-Menten model, Vmax and Km, for converting cellulose to glucose were of 6.00 % (w/w)/h and 22.59 gcellulose/Lsolution, respectively. A residue-free and effective corncob extrusion pretreatment enhanced high solids loading enzymatic hydrolysis to achieve a glucose-rich solution.
Palavras-Chave:
enzymatic hydrolysis;
plants;
biomass;
maize;
cellulose;
microstructure
JOSE, ALVARO H.M.; MOURA, ESPERIDIANA A.B.; RODRIGUES JUNIOR, DURVAL; KLEINGESINDS, EDUARDO K.; RODRIGUES, RITA C.L.B.
A residue-free and effective corncob extrusion pretreatment for the enhancement of high solids loading enzymatic hydrolysis to produce sugars.
Industrial Crops and Products,
v. 188,
n. Part B,
p. 1-11,
2022.
DOI:
10.1016/j.indcrop.2022.115655.
Disponível em: http://repositorio.ipen.br/handle/123456789/33419. Acesso em: $DATA.
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A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.
✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do
Buscar no Repositório
, isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.
✔ A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em
Navegar
✔ Os filtros disponíveis em
Navegar
tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro,
Autores IPEN
apresenta uma relação com os autores vinculados ao IPEN; o
ID Autor IPEN
diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome;
Tipo de acesso
diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.
A opção
Busca avançada
utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.
Exemplo:
Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.
Autor: Maprelian
Título: loss of coolant
Tipo de publicação: Texto completo de evento
Ano de publicação: 2015
✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da
International Atomic Energy Agency – IAEA
, por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.
✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o
significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN,
bibl@ipen.br
.
✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.
✔ O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.
✔ Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo
será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.
✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).
ATENÇÃO!
ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.
O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.
A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.
1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI,
clique aqui.
2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI,
clique aqui.
O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.
Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.
A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.
O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.