Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/10476 |
Resumo: | Poly (lactic acid) (PLA) is a non-toxic, transparent and biodegradable aliphatic polyester, produced from renewable raw materials. This polymer meets several requirements for packaging applications, but is fragile and has lower gas and water vapor barrier properties, compared to polymers currently used in this application. The formation of PLA blends with poly (ethylene-co-vinyl alcohol) (EVOH), which has transparency and good gas barrier properties, is an advantageous alternative to modify this biodegradable polymer, in order to obtain better mechanical and barrier properties without loss of transparency. This research objective was to develop biodegradable PLA/EVOH nanoblends, for packaging application, through reactive extrusion followed by the production of films. EVOH was added in 3, 5 and 10 wt%. Two compatibilization systems, containing epoxy as the reactive group, and a catalyst of the reaction between epoxy and hydroxyl, were used for interfacial modification. The influence of the dispersed phase content, the use of different compatibilizers and the presence of the catalyst in the thermal, mechanical, rheological, optical and barrier properties, as well as the the morphology of the blends, were analyzed. It was possible to observe a reduction in the diameter of the dispersed EVOH particles in the PLA matrix through reactive extrusion and addition of compatibilizing systems. The reduction was even more significant with the use of the catalyst, reaching values very close to the nanometric scale, but resulted in the degradation of the PLA matrix. The blends compatibilized with GMA and peroxide presented the best mechanical performance, however still very close to the PLA matrix. The barrier properties of all blends were higher than those of PLA. The blends showed transparency when the film is positioned close to the object, thus presenting sufficient optical property for packaging application. |
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Santos, Luiza GouvêaCosta, Lidiane Cristinahttp://lattes.cnpq.br/8246109223926480Pessan, Luiz Antoniohttp://lattes.cnpq.br/8276650236213537http://lattes.cnpq.br/2281474085234563e6c62a01-8a2c-434c-ab74-a0c497e577cc2018-09-17T23:33:27Z2018-09-17T23:33:27Z2018-07-20SANTOS, Luiza Gouvêa. Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores. 2018. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10476.https://repositorio.ufscar.br/handle/ufscar/10476Poly (lactic acid) (PLA) is a non-toxic, transparent and biodegradable aliphatic polyester, produced from renewable raw materials. This polymer meets several requirements for packaging applications, but is fragile and has lower gas and water vapor barrier properties, compared to polymers currently used in this application. The formation of PLA blends with poly (ethylene-co-vinyl alcohol) (EVOH), which has transparency and good gas barrier properties, is an advantageous alternative to modify this biodegradable polymer, in order to obtain better mechanical and barrier properties without loss of transparency. This research objective was to develop biodegradable PLA/EVOH nanoblends, for packaging application, through reactive extrusion followed by the production of films. EVOH was added in 3, 5 and 10 wt%. Two compatibilization systems, containing epoxy as the reactive group, and a catalyst of the reaction between epoxy and hydroxyl, were used for interfacial modification. The influence of the dispersed phase content, the use of different compatibilizers and the presence of the catalyst in the thermal, mechanical, rheological, optical and barrier properties, as well as the the morphology of the blends, were analyzed. It was possible to observe a reduction in the diameter of the dispersed EVOH particles in the PLA matrix through reactive extrusion and addition of compatibilizing systems. The reduction was even more significant with the use of the catalyst, reaching values very close to the nanometric scale, but resulted in the degradation of the PLA matrix. The blends compatibilized with GMA and peroxide presented the best mechanical performance, however still very close to the PLA matrix. The barrier properties of all blends were higher than those of PLA. The blends showed transparency when the film is positioned close to the object, thus presenting sufficient optical property for packaging application.O poli (ácido láctico) (PLA) é um poliéster alifático, atóxico, transparente e biodegradável, produzido a partir de matérias-primas renováveis. Este polímero atende a vários requisitos para aplicação em embalagens, porém é frágil e apresenta propriedades menores de barreira a gases e ao vapor de água, em comparação a polímeros utilizados atualmente nesta aplicação. A formação de blendas de PLA com o poli (etileno-co-álcool vinílico) (EVOH), que possui transparência e boas propriedades de barreira a gases, apresenta-se como uma alternativa vantajosa para modificar esse polímero, a fim de se obter melhores propriedades mecânicas e de barreira, sem a perda da transparência. Esta pesquisa teve como objetivo o desenvolvimento de nanoblendas PLA/EVOH biodegradáveis para aplicação em embalagens por meio de extrusão reativa seguida da produção de filmes. O EVOH foi adicionado em 3, 5 e 10% em massa. Dois sistemas de compatibilização, contendo o grupo reativo epóxi, além de um catalisador da reação entre o epóxi e a hidroxila, foram utilizados para modificação interfacial. A influência do teor da fase dispersa, do uso dos diferentes compatibilizantes e da presença do catalisador nas propriedades térmicas, mecânicas, reológicas, ópticas e de barreira, assim como na morfologia das blendas, foi analisada. Foi possível observar redução no diâmetro das partículas dispersas de EVOH na matriz de PLA, através de extrusão reativa e adição dos sistemas compatibilizantes. A redução foi ainda mais significativa com o uso do catalisador ZnSt2, atingindo valores muito próximos à escala nanométrica, porém resultou na degradação da matriz PLA. As blendas compatibilizadas com GMA e peróxido apresentaram o melhor desempenho mecânico, entretanto ainda muito próximo ao da matriz PLA. As propriedades de barreira de todas as blendas foram superiores à do PLA. As blendas apresentaram transparência quando o filme é posicionado próximo ao objeto, apresentando assim propriedade óptica suficiente para aplicação em embalagens.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)CNPq: 134655/2016-8porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarPLA/EVOHBlendas biodegradáveisPLA/EVOHbiodegradable blendsENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICADesenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vaporesDevelopment of biodegradable PLA/EVOH Nanoblends with barrier characteristics to gases and vaporinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOnline600600c3114f43-669a-4f5e-a6b6-6f01714c7215info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARLICENSElicense.txtlicense.txttext/plain; charset=utf-81957https://repositorio.ufscar.br/bitstream/ufscar/10476/3/license.txtae0398b6f8b235e40ad82cba6c50031dMD53ORIGINALSANTOS_Luiza_2018.pdfSANTOS_Luiza_2018.pdfapplication/pdf10565562https://repositorio.ufscar.br/bitstream/ufscar/10476/4/SANTOS_Luiza_2018.pdf13492cd06232cc330f2ba1e52264b916MD54TEXTSANTOS_Luiza_2018.pdf.txtSANTOS_Luiza_2018.pdf.txtExtracted texttext/plain249487https://repositorio.ufscar.br/bitstream/ufscar/10476/5/SANTOS_Luiza_2018.pdf.txt38b143889220519649295f797c225e90MD55THUMBNAILSANTOS_Luiza_2018.pdf.jpgSANTOS_Luiza_2018.pdf.jpgIM Thumbnailimage/jpeg6475https://repositorio.ufscar.br/bitstream/ufscar/10476/6/SANTOS_Luiza_2018.pdf.jpg5b641aaa6d5d354114f21c1aefc0bf04MD56ufscar/104762023-09-18 18:31:16.938oai:repositorio.ufscar.br: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Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:16Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores |
dc.title.alternative.eng.fl_str_mv |
Development of biodegradable PLA/EVOH Nanoblends with barrier characteristics to gases and vapor |
title |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores |
spellingShingle |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores Santos, Luiza Gouvêa PLA/EVOH Blendas biodegradáveis PLA/EVOH biodegradable blends ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores |
title_full |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores |
title_fullStr |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores |
title_full_unstemmed |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores |
title_sort |
Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores |
author |
Santos, Luiza Gouvêa |
author_facet |
Santos, Luiza Gouvêa |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/2281474085234563 |
dc.contributor.author.fl_str_mv |
Santos, Luiza Gouvêa |
dc.contributor.advisor1.fl_str_mv |
Costa, Lidiane Cristina |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/8246109223926480 |
dc.contributor.advisor-co1.fl_str_mv |
Pessan, Luiz Antonio |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/8276650236213537 |
dc.contributor.authorID.fl_str_mv |
e6c62a01-8a2c-434c-ab74-a0c497e577cc |
contributor_str_mv |
Costa, Lidiane Cristina Pessan, Luiz Antonio |
dc.subject.por.fl_str_mv |
PLA/EVOH Blendas biodegradáveis |
topic |
PLA/EVOH Blendas biodegradáveis PLA/EVOH biodegradable blends ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.eng.fl_str_mv |
PLA/EVOH biodegradable blends |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
Poly (lactic acid) (PLA) is a non-toxic, transparent and biodegradable aliphatic polyester, produced from renewable raw materials. This polymer meets several requirements for packaging applications, but is fragile and has lower gas and water vapor barrier properties, compared to polymers currently used in this application. The formation of PLA blends with poly (ethylene-co-vinyl alcohol) (EVOH), which has transparency and good gas barrier properties, is an advantageous alternative to modify this biodegradable polymer, in order to obtain better mechanical and barrier properties without loss of transparency. This research objective was to develop biodegradable PLA/EVOH nanoblends, for packaging application, through reactive extrusion followed by the production of films. EVOH was added in 3, 5 and 10 wt%. Two compatibilization systems, containing epoxy as the reactive group, and a catalyst of the reaction between epoxy and hydroxyl, were used for interfacial modification. The influence of the dispersed phase content, the use of different compatibilizers and the presence of the catalyst in the thermal, mechanical, rheological, optical and barrier properties, as well as the the morphology of the blends, were analyzed. It was possible to observe a reduction in the diameter of the dispersed EVOH particles in the PLA matrix through reactive extrusion and addition of compatibilizing systems. The reduction was even more significant with the use of the catalyst, reaching values very close to the nanometric scale, but resulted in the degradation of the PLA matrix. The blends compatibilized with GMA and peroxide presented the best mechanical performance, however still very close to the PLA matrix. The barrier properties of all blends were higher than those of PLA. The blends showed transparency when the film is positioned close to the object, thus presenting sufficient optical property for packaging application. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-09-17T23:33:27Z |
dc.date.available.fl_str_mv |
2018-09-17T23:33:27Z |
dc.date.issued.fl_str_mv |
2018-07-20 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SANTOS, Luiza Gouvêa. Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores. 2018. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10476. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/10476 |
identifier_str_mv |
SANTOS, Luiza Gouvêa. Desenvolvimento de Nanoblendas PLA/EVOH biodegradáveis com características de barreira a gases e vapores. 2018. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10476. |
url |
https://repositorio.ufscar.br/handle/ufscar/10476 |
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por |
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por |
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600 600 |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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Universidade Federal de São Carlos Câmpus São Carlos |
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