Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils.
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/6683 https://doi.org/10.1016/j.cej.2015.10.097 |
Resumo: | This work aimed to evaluate the effect of including different concentrations of bamboo nanofibrils on physical, mechanical, morphological and structural properties of nanocomposites from cassava starch and polyvinyl alcohol (PVA). Nanocomposites were prepared with blends of starch/PVA and nanofibrils of bamboo. Chemical pre-treatments and mechanical defibrillation were used to obtain the nanofibrils. The mixture containing 3% of starch and 4% of PVA in the proportion of 20/80 (starch/PVA) were chosen after preliminary testing. Atomic force microscopy (AFM) and transmission electronic microscopy (TEM) were used to characterize the bamboo nanofibrils. Microstructure of the nanocomposites was evaluated using scanning electron microscopy (SEM) and X-ray diffractrometry (XRD). Physical and mechanical properties were also evaluated. Results showed that pre-chemical treatments increased the content of the alpha-cellulose in bleached pulp by approximately 112% in relation to the native fiber. Increasing the number of passages through the defibrillator reduced the average diameter of the bamboo nanofibrils (from 82±29nmto 10±6 nm). Addition of 6.5% nanofibrils improved the tensile strength and elongation at the break of the nanocomposite by 24 and 51%, respectively, but reduced the tensile modulus by 40% in relation to control (unreinforced) blend. Nanofibrils decreased the transparency of the nanocomposite films. The water vapor permeability and water solubility of the nanocomposite containing high contents of nanofibrils decreased up to 20% and 30%, respectively, in relation to the control blend. |
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Guimarães Júnior, MárioBotaro, Vagner RobertoNovack, Kátia MonteiroTeixeira, Fábio GomesTonoli, Gustavo Henrique Denzin2016-07-29T16:52:46Z2016-07-29T16:52:46Z2015GUIMARÃES JÚNIOR, B. et al. Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. Industrial Crops and Products, v. 70, p. 72-83, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0926669015001892>. Acesso em: 16 jun. 2016.0926-6690http://www.repositorio.ufop.br/handle/123456789/6683https://doi.org/10.1016/j.cej.2015.10.097This work aimed to evaluate the effect of including different concentrations of bamboo nanofibrils on physical, mechanical, morphological and structural properties of nanocomposites from cassava starch and polyvinyl alcohol (PVA). Nanocomposites were prepared with blends of starch/PVA and nanofibrils of bamboo. Chemical pre-treatments and mechanical defibrillation were used to obtain the nanofibrils. The mixture containing 3% of starch and 4% of PVA in the proportion of 20/80 (starch/PVA) were chosen after preliminary testing. Atomic force microscopy (AFM) and transmission electronic microscopy (TEM) were used to characterize the bamboo nanofibrils. Microstructure of the nanocomposites was evaluated using scanning electron microscopy (SEM) and X-ray diffractrometry (XRD). Physical and mechanical properties were also evaluated. Results showed that pre-chemical treatments increased the content of the alpha-cellulose in bleached pulp by approximately 112% in relation to the native fiber. Increasing the number of passages through the defibrillator reduced the average diameter of the bamboo nanofibrils (from 82±29nmto 10±6 nm). Addition of 6.5% nanofibrils improved the tensile strength and elongation at the break of the nanocomposite by 24 and 51%, respectively, but reduced the tensile modulus by 40% in relation to control (unreinforced) blend. Nanofibrils decreased the transparency of the nanocomposite films. The water vapor permeability and water solubility of the nanocomposite containing high contents of nanofibrils decreased up to 20% and 30%, respectively, in relation to the control blend.O periódico Industrial Crops and Products concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3898810812292.info:eu-repo/semantics/openAccessNanofibrilsBionanocompositeBamboo pulpMechanical defibrillationStarch/PVA-based nanocomposites reinforced with bamboo nanofibrils.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-8924http://www.repositorio.ufop.br/bitstream/123456789/6683/2/license.txt62604f8d955274beb56c80ce1ee5dcaeMD52ORIGINALARTIGO_StarchPVANanocomposites.pdfARTIGO_StarchPVANanocomposites.pdfapplication/pdf3880928http://www.repositorio.ufop.br/bitstream/123456789/6683/1/ARTIGO_StarchPVANanocomposites.pdf69a0fdb937ca04350ba8a32281c20561MD51123456789/66832019-09-23 10:08:08.048oai:localhost:123456789/6683RGVjbGFyYcOnw6NvIGRlIGRpc3RyaWJ1acOnw6NvIG7Do28tZXhjbHVzaXZhCgpPIHJlZmVyaWRvIGF1dG9yOgoKYSlEZWNsYXJhIHF1ZSBvIGRvY3VtZW50byBlbnRyZWd1ZSDDqSBzZXUgdHJhYmFsaG8gb3JpZ2luYWwgZSBxdWUgZGV0w6ltIG8gZGlyZWl0byBkZSBjb25jZWRlciBvcyBkaXJlaXRvcyBjb250aWRvcyBuZXN0YSBsaWNlbsOnYS4gRGVjbGFyYSB0YW1iw6ltIHF1ZSBhIGVudHJlZ2EgZG8gZG9jdW1lbnRvIG7Do28gaW5mcmluZ2UsIHRhbnRvIHF1YW50byBsaGUgw6kgcG9zc8OtdmVsIHNhYmVyLCBvcyBkaXJlaXRvcyBkZSBxdWFscXVlciBwZXNzb2Egb3UgZW50aWRhZGUuCgpiKVNlIG8gZG9jdW1lbnRvIGVudHJlZ3VlIGNvbnTDqW0gbWF0ZXJpYWwgZG8gcXVhbCBuw6NvIGRldMOpbSBvcyBkaXJlaXRvcyBkZSBhdXRvciwgZGVjbGFyYSBxdWUgb2J0ZXZlIGF1dG9yaXphw6fDo28gZG8gZGV0ZW50b3IgZG9zIGRpcmVpdG9zIGRlIGF1dG9yIHBhcmEgY29uY2VkZXIgw6AgVW5pdmVyc2lkYWRlIEZlZGVyYWwgZGUgT3VybyBQcmV0by9VRk9QIG9zIGRpcmVpdG9zIHJlcXVlcmlkb3MgcG9yIGVzdGEgbGljZW7Dp2EgZSBxdWUgZXNzZSBtYXRlcmlhbCwgY3Vqb3MgZGlyZWl0b3Mgc8OjbyBkZSB0ZXJjZWlyb3MsIGVzdMOhIGNsYXJhbWVudGUgaWRlbnRpZmljYWRvIGUgcmVjb25oZWNpZG8gbm8gdGV4dG8gb3UgY29udGXDumRvcyBkbyBkb2N1bWVudG8gZW50cmVndWUuCgpjKVNlIG8gZG9jdW1lbnRvIGVudHJlZ3VlIMOpIGJhc2VhZG8gZW0gdHJhYmFsaG8gZmluYW5jaWFkbyBvdSBhcG9pYWRvIHBvciBvdXRyYSBpbnN0aXR1acOnw6NvIHF1ZSBuw6NvIGEgVUZPUCwgZGVjbGFyYSBxdWUgY3VtcHJpdSBxdWFpc3F1ZXIgb2JyaWdhw6fDtWVzIGV4aWdpZGFzIHBlbG8gY29udHJhdG8gb3UgYWNvcmRvLgoKRepositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-09-23T14:08:08Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. |
title |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. |
spellingShingle |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. Guimarães Júnior, Mário Nanofibrils Bionanocomposite Bamboo pulp Mechanical defibrillation |
title_short |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. |
title_full |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. |
title_fullStr |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. |
title_full_unstemmed |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. |
title_sort |
Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. |
author |
Guimarães Júnior, Mário |
author_facet |
Guimarães Júnior, Mário Botaro, Vagner Roberto Novack, Kátia Monteiro Teixeira, Fábio Gomes Tonoli, Gustavo Henrique Denzin |
author_role |
author |
author2 |
Botaro, Vagner Roberto Novack, Kátia Monteiro Teixeira, Fábio Gomes Tonoli, Gustavo Henrique Denzin |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Guimarães Júnior, Mário Botaro, Vagner Roberto Novack, Kátia Monteiro Teixeira, Fábio Gomes Tonoli, Gustavo Henrique Denzin |
dc.subject.por.fl_str_mv |
Nanofibrils Bionanocomposite Bamboo pulp Mechanical defibrillation |
topic |
Nanofibrils Bionanocomposite Bamboo pulp Mechanical defibrillation |
description |
This work aimed to evaluate the effect of including different concentrations of bamboo nanofibrils on physical, mechanical, morphological and structural properties of nanocomposites from cassava starch and polyvinyl alcohol (PVA). Nanocomposites were prepared with blends of starch/PVA and nanofibrils of bamboo. Chemical pre-treatments and mechanical defibrillation were used to obtain the nanofibrils. The mixture containing 3% of starch and 4% of PVA in the proportion of 20/80 (starch/PVA) were chosen after preliminary testing. Atomic force microscopy (AFM) and transmission electronic microscopy (TEM) were used to characterize the bamboo nanofibrils. Microstructure of the nanocomposites was evaluated using scanning electron microscopy (SEM) and X-ray diffractrometry (XRD). Physical and mechanical properties were also evaluated. Results showed that pre-chemical treatments increased the content of the alpha-cellulose in bleached pulp by approximately 112% in relation to the native fiber. Increasing the number of passages through the defibrillator reduced the average diameter of the bamboo nanofibrils (from 82±29nmto 10±6 nm). Addition of 6.5% nanofibrils improved the tensile strength and elongation at the break of the nanocomposite by 24 and 51%, respectively, but reduced the tensile modulus by 40% in relation to control (unreinforced) blend. Nanofibrils decreased the transparency of the nanocomposite films. The water vapor permeability and water solubility of the nanocomposite containing high contents of nanofibrils decreased up to 20% and 30%, respectively, in relation to the control blend. |
publishDate |
2015 |
dc.date.issued.fl_str_mv |
2015 |
dc.date.accessioned.fl_str_mv |
2016-07-29T16:52:46Z |
dc.date.available.fl_str_mv |
2016-07-29T16:52:46Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
GUIMARÃES JÚNIOR, B. et al. Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. Industrial Crops and Products, v. 70, p. 72-83, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0926669015001892>. Acesso em: 16 jun. 2016. |
dc.identifier.uri.fl_str_mv |
http://www.repositorio.ufop.br/handle/123456789/6683 |
dc.identifier.issn.none.fl_str_mv |
0926-6690 |
dc.identifier.doi.none.fl_str_mv |
https://doi.org/10.1016/j.cej.2015.10.097 |
identifier_str_mv |
GUIMARÃES JÚNIOR, B. et al. Starch/PVA-based nanocomposites reinforced with bamboo nanofibrils. Industrial Crops and Products, v. 70, p. 72-83, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0926669015001892>. Acesso em: 16 jun. 2016. 0926-6690 |
url |
http://www.repositorio.ufop.br/handle/123456789/6683 https://doi.org/10.1016/j.cej.2015.10.097 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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reponame:Repositório Institucional da UFOP instname:Universidade Federal de Ouro Preto (UFOP) instacron:UFOP |
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Universidade Federal de Ouro Preto (UFOP) |
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UFOP |
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Repositório Institucional da UFOP |
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Repositório Institucional da UFOP |
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repositorio@ufop.edu.br |
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