Development of hydrophobic thermoplastic starch composites

Detalhes bibliográficos
Autor(a) principal: Fazeli, Mahyar
Data de Publicação: 2018
Tipo de documento: Tese
Idioma: eng
Título da fonte: Repositório Institucional da UFRJ
Texto Completo: http://hdl.handle.net/11422/7843
Resumo: This work deals with provision and characterization of the biopolymer-based composites achieved by incorporation of cellulose fibers as the reinforcement within the glycerol plasticized matrix formed by thermoplastic cornstarch biopolymer. The function of starch-based polymers is limited due to poor mechanical properties. However, it is improved with forming a biocomposite of thermoplastic starch (TPS) as matrix and the cellulose fibers (CF) as reinforcement. The surface of cellulose fibers is successfully modified using the air plasma treatment with the aim of improving the matrix/fiber adhesion. The modified fibers are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The TPS/CF composites are prepared using high friction and hot compression procedure. Tensile test results and SEM images of the fracture surfaces show significant improvement of adhesion between treated cellulose fibers and TPS matrix. In another hand, starch nanoparticles (SNP) were prepared by delivering ethanol as the precipitant into starch-paste solution dropwise. According to the characterization of starch nanoparticles with FTIR, XRD and SEM, amorphous SNP could not be gelatinized in hot water because of the cross-linking. The TPS/SNP films were also prepared using casting process. SEM and atomic force microscopy (AFM) revealed that SNP was dispersed evenly in the starch matrix. As shown in the dynamic mechanical thermal analysis (DMA) and TGA, the introduction of SNP could improve the storage modulus and the glass transition temperature of the prepared films.
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spelling Development of hydrophobic thermoplastic starch compositesEngenharia metalúrgica e de materiaisFibras de celuloseCompósitos à base de biopolímeroCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAThis work deals with provision and characterization of the biopolymer-based composites achieved by incorporation of cellulose fibers as the reinforcement within the glycerol plasticized matrix formed by thermoplastic cornstarch biopolymer. The function of starch-based polymers is limited due to poor mechanical properties. However, it is improved with forming a biocomposite of thermoplastic starch (TPS) as matrix and the cellulose fibers (CF) as reinforcement. The surface of cellulose fibers is successfully modified using the air plasma treatment with the aim of improving the matrix/fiber adhesion. The modified fibers are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The TPS/CF composites are prepared using high friction and hot compression procedure. Tensile test results and SEM images of the fracture surfaces show significant improvement of adhesion between treated cellulose fibers and TPS matrix. In another hand, starch nanoparticles (SNP) were prepared by delivering ethanol as the precipitant into starch-paste solution dropwise. According to the characterization of starch nanoparticles with FTIR, XRD and SEM, amorphous SNP could not be gelatinized in hot water because of the cross-linking. The TPS/SNP films were also prepared using casting process. SEM and atomic force microscopy (AFM) revealed that SNP was dispersed evenly in the starch matrix. As shown in the dynamic mechanical thermal analysis (DMA) and TGA, the introduction of SNP could improve the storage modulus and the glass transition temperature of the prepared films.Este trabalho trata do fornecimento e caracterização de compósitos à base de biopolímero obtidos pela incorporação de fibras de celulose como reforço dentro da matriz plastificada de glicerol formada por biopolímero de amido de milho termoplástico. A função dos polímeros à base de amido é limitada devido a propriedades mecânicas ruins. No entanto, melhora-se com a formação de um biocompósito de amido termoplástico (TPS) como matriz e as fibras de celulose (CF) como reforço. A superfície das fibras de celulose é modificada com sucesso usando o tratamento com plasma de ar com o objetivo de melhorar a adesão matriz / fibra. As fibras modificadas são estudadas por meio de difração de raios X (DRX), microscopia eletrônica de varredura (MEV) e espectroscopia de infravermelho por transformada de Fourier (FTIR). Os compósitos TPS/CF são preparados usando procedimentos de alta fricção e compressão a quente. Resultados de testes de tração e imagens de MEV das superfícies de fratura mostram uma melhora significativa na adesão entre as fibras de celulose tratadas e a matriz de TPS. Por outro lado, as nanopartículas de amido (SNP) foram preparadas pela entrega de etanol como precipitante na solução de pasta de amido, gota a gota. De acordo com a caracterização de nanopartículas de amido com FTIR, DRX e MEV, o SNP amorfo não pode ser gelatinizado em água quente por causa do cross-linking. Os filmes TPS/SNP também foram preparados usando o processo de fundição. MEV e microscopia de força atômica (AFM) revelaram que o SNP foi disperso uniformemente na matriz de amido. Como mostrado na análise térmica mecânica dinâmica (DMA) e TGA, a introdução do SNP poderia melhorar o módulo de armazenamento e a temperatura de transição vítrea dos filmes preparados.Universidade Federal do Rio de JaneiroBrasilInstituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de EngenhariaPrograma de Pós-Graduação em Engenharia Metalúrgica e de MateriaisUFRJSimão, Renata Antounhttp://lattes.cnpq.br/3874986142310772D'Almeida, Jose Roberto MoraesCalado, Veronica Maria de AraujoThiré, Rossana Mara da Silva MoreiraDias, Marcos LopesFazeli, Mahyar2019-05-09T17:01:48Z2023-12-21T03:02:07Z2018-11info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesishttp://hdl.handle.net/11422/7843enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRJinstname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJ2023-12-21T03:02:07Zoai:pantheon.ufrj.br:11422/7843Repositório InstitucionalPUBhttp://www.pantheon.ufrj.br/oai/requestpantheon@sibi.ufrj.bropendoar:2023-12-21T03:02:07Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Development of hydrophobic thermoplastic starch composites
title Development of hydrophobic thermoplastic starch composites
spellingShingle Development of hydrophobic thermoplastic starch composites
Fazeli, Mahyar
Engenharia metalúrgica e de materiais
Fibras de celulose
Compósitos à base de biopolímero
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
title_short Development of hydrophobic thermoplastic starch composites
title_full Development of hydrophobic thermoplastic starch composites
title_fullStr Development of hydrophobic thermoplastic starch composites
title_full_unstemmed Development of hydrophobic thermoplastic starch composites
title_sort Development of hydrophobic thermoplastic starch composites
author Fazeli, Mahyar
author_facet Fazeli, Mahyar
author_role author
dc.contributor.none.fl_str_mv Simão, Renata Antoun
http://lattes.cnpq.br/3874986142310772
D'Almeida, Jose Roberto Moraes
Calado, Veronica Maria de Araujo
Thiré, Rossana Mara da Silva Moreira
Dias, Marcos Lopes
dc.contributor.author.fl_str_mv Fazeli, Mahyar
dc.subject.por.fl_str_mv Engenharia metalúrgica e de materiais
Fibras de celulose
Compósitos à base de biopolímero
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
topic Engenharia metalúrgica e de materiais
Fibras de celulose
Compósitos à base de biopolímero
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
description This work deals with provision and characterization of the biopolymer-based composites achieved by incorporation of cellulose fibers as the reinforcement within the glycerol plasticized matrix formed by thermoplastic cornstarch biopolymer. The function of starch-based polymers is limited due to poor mechanical properties. However, it is improved with forming a biocomposite of thermoplastic starch (TPS) as matrix and the cellulose fibers (CF) as reinforcement. The surface of cellulose fibers is successfully modified using the air plasma treatment with the aim of improving the matrix/fiber adhesion. The modified fibers are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The TPS/CF composites are prepared using high friction and hot compression procedure. Tensile test results and SEM images of the fracture surfaces show significant improvement of adhesion between treated cellulose fibers and TPS matrix. In another hand, starch nanoparticles (SNP) were prepared by delivering ethanol as the precipitant into starch-paste solution dropwise. According to the characterization of starch nanoparticles with FTIR, XRD and SEM, amorphous SNP could not be gelatinized in hot water because of the cross-linking. The TPS/SNP films were also prepared using casting process. SEM and atomic force microscopy (AFM) revealed that SNP was dispersed evenly in the starch matrix. As shown in the dynamic mechanical thermal analysis (DMA) and TGA, the introduction of SNP could improve the storage modulus and the glass transition temperature of the prepared films.
publishDate 2018
dc.date.none.fl_str_mv 2018-11
2019-05-09T17:01:48Z
2023-12-21T03:02:07Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/11422/7843
url http://hdl.handle.net/11422/7843
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
dc.publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Metalúrgica e de Materiais
UFRJ
publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Metalúrgica e de Materiais
UFRJ
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRJ
instname:Universidade Federal do Rio de Janeiro (UFRJ)
instacron:UFRJ
instname_str Universidade Federal do Rio de Janeiro (UFRJ)
instacron_str UFRJ
institution UFRJ
reponame_str Repositório Institucional da UFRJ
collection Repositório Institucional da UFRJ
repository.name.fl_str_mv Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)
repository.mail.fl_str_mv pantheon@sibi.ufrj.br
_version_ 1815455987967983616

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