Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais

Detalhes bibliográficos
Autor(a) principal: PAIXÃO, Louryval Coelho
Data de Publicação: 2019
Tipo de documento: Tese
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFMA
Texto Completo: https://tedebc.ufma.br/jspui/handle/tede/tede/3011
Resumo: Plastic materials are not always safe or environmentally friendly. Alternatively to these materials are biopolymers, which are polymers derived from living organisms or synthesized from renewable resources such as polysaccharides, proteins and lipids. These materials include babassu coconut mesocarp alginate, pectin and starch. Although these materials have promising application in the production of biopolymers, they are completely soluble in water, with high leaching tendency and low mechanical resistance. The combination of these and the use of plant fibers, such as fibers from the coconut of the bay-coconut and babassu coconut epicarp are being studied in this research, in order to improve the properties of these polymeric matrices, also considering the physical processes. and chemicals used in these fibers so that their dimensions are adequate and the fiber-to-matrix ratio is improved. Another important fact to study in the elaboration of biopolymers is the choice of plasticizers. In polysaccharides, for example, the most commonly used plasticizers are polyols (such as glycerol - G). These plasticizers make biopolymers more hydrophilic which may contribute to increase the water permeability and the susceptibility of the matrix to the humidity of the environment. Alternatively, hydrophobic plasticizers (such as tributyl citrate - CT) will help reduce this behavior. Thus, this work aims to elaborate and characterize sodium alginate biopolymers with different plasticizers and the use of coconut babassu pectin, alginate and mesocarp as base compounds with incorporation of natural plant fibers such as coconut-bay mesocarp and epicarp of babassu coconut in order to provide good mechanical, thermal, physical resistance and low leaching/solubilization tendency. The biopolymers were made according to the casting technique, in which a filmogenic solution was prepared and poured on a support, subsequently dried and stored at a relative humidity of 52%. G-plasticized alginate biopolymers were more hygroscopic than those with CT or CT / G mixtures. Plasticizer CT has made the water-soluble biopolymers with better mechanical properties. Sorption isotherms were well adjusted to the GAB model, with R2 close to 1 and low relative mean deviation. All biopolymers showed a single sharp Tg peak, showing higher values in the presence of CT. In the article of pectin with the fibers of the coconut from the bay of coconut, two experimental designs were applied for the treatment of the fibers (in natura fibers and chemically treated with 5% NaOH - m/m). The chemical treatment was efficient to partially remove hemicellulose and lignin from the fibers, with peaks reduction of ~ 1700 cm-1 related to these substances; the fibers caused more stable films to solubilization and leaching. Formulations with 9 g pectin/2 g fiber and 5 g pectin/0.5 g fiber were recommended as the selected conditions. Biopolymers formulated with 9 g of pectin/2 g of fibers showed the best results in tensile strength and elongation at break (2.35 MPa and 7.31%, respectively) for the treated fibers. In the mesocarp alginate article with babassu coconut epicarp fibers an experimental design of mixtures was applied, in which formulations 11 and 13 were selected. These formulations were subjected to a second cross-linking step which confirmed that the material had a low tendency to water absorption and compact and relatively homogeneous microstructure for fiber content. The best formulations have the potential to be applied to pilot tests and industrially produced.
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spelling BARROS FILHO, Allan Kardec D.340225893-53http://lattes.cnpq.br/0492330410079141SANTANA, Audirene Amorim880372743-49http://lattes.cnpq.br/7431678688628387BARROS FILHO, Allan Kardec D.http://lattes.cnpq.br/0492330410079141BORGES, Antônio Carlos Romãohttp://lattes.cnpq.br/4315209704773266CRUZ, Glauberhttp://lattes.cnpq.br/5194234696644344BORGES, Ferdinando Marco Rodrigueshttp://lattes.cnpq.br/6492640007982658MOUCHREK FILHO, Victor Eliashttp://lattes.cnpq.br/2381183158978639833829173-00http://lattes.cnpq.br/8697027182338512PAIXÃO, Louryval Coelho2020-01-27T14:28:33Z2019-12-16PAIXÃO, Louryval Coelho. Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais. 2019. 146 f. Tese (Programa de Pós-Graduação em Biotecnologia - Renorbio/CCBS) - Universidade Federal do Maranhão, São Luís, 2019.https://tedebc.ufma.br/jspui/handle/tede/tede/3011Plastic materials are not always safe or environmentally friendly. Alternatively to these materials are biopolymers, which are polymers derived from living organisms or synthesized from renewable resources such as polysaccharides, proteins and lipids. These materials include babassu coconut mesocarp alginate, pectin and starch. Although these materials have promising application in the production of biopolymers, they are completely soluble in water, with high leaching tendency and low mechanical resistance. The combination of these and the use of plant fibers, such as fibers from the coconut of the bay-coconut and babassu coconut epicarp are being studied in this research, in order to improve the properties of these polymeric matrices, also considering the physical processes. and chemicals used in these fibers so that their dimensions are adequate and the fiber-to-matrix ratio is improved. Another important fact to study in the elaboration of biopolymers is the choice of plasticizers. In polysaccharides, for example, the most commonly used plasticizers are polyols (such as glycerol - G). These plasticizers make biopolymers more hydrophilic which may contribute to increase the water permeability and the susceptibility of the matrix to the humidity of the environment. Alternatively, hydrophobic plasticizers (such as tributyl citrate - CT) will help reduce this behavior. Thus, this work aims to elaborate and characterize sodium alginate biopolymers with different plasticizers and the use of coconut babassu pectin, alginate and mesocarp as base compounds with incorporation of natural plant fibers such as coconut-bay mesocarp and epicarp of babassu coconut in order to provide good mechanical, thermal, physical resistance and low leaching/solubilization tendency. The biopolymers were made according to the casting technique, in which a filmogenic solution was prepared and poured on a support, subsequently dried and stored at a relative humidity of 52%. G-plasticized alginate biopolymers were more hygroscopic than those with CT or CT / G mixtures. Plasticizer CT has made the water-soluble biopolymers with better mechanical properties. Sorption isotherms were well adjusted to the GAB model, with R2 close to 1 and low relative mean deviation. All biopolymers showed a single sharp Tg peak, showing higher values in the presence of CT. In the article of pectin with the fibers of the coconut from the bay of coconut, two experimental designs were applied for the treatment of the fibers (in natura fibers and chemically treated with 5% NaOH - m/m). The chemical treatment was efficient to partially remove hemicellulose and lignin from the fibers, with peaks reduction of ~ 1700 cm-1 related to these substances; the fibers caused more stable films to solubilization and leaching. Formulations with 9 g pectin/2 g fiber and 5 g pectin/0.5 g fiber were recommended as the selected conditions. Biopolymers formulated with 9 g of pectin/2 g of fibers showed the best results in tensile strength and elongation at break (2.35 MPa and 7.31%, respectively) for the treated fibers. In the mesocarp alginate article with babassu coconut epicarp fibers an experimental design of mixtures was applied, in which formulations 11 and 13 were selected. These formulations were subjected to a second cross-linking step which confirmed that the material had a low tendency to water absorption and compact and relatively homogeneous microstructure for fiber content. The best formulations have the potential to be applied to pilot tests and industrially produced.Os materiais poliméricos não biodegradáveis, proveniente de fontes fósseis, nem sempre são seguros ou amigo do meio ambiente. Como alternativa a esses materiais, estão os biopolímeros, que são polímeros derivados de organismos vivos ou sintetizada a partir de recursos renováveis, tais como polissacarídeos, proteínas e lipídios. Dentre estes materiais estão o alginato, pectina e amido de mesocarpo de coco babaçu. Apesar destes materiais apresentarem aplicação promissora na produção de biopolímeros, eles se mostram completamente solúveis em água, com alta tendência a lixiviação e baixa resistência mecânica. A combinação entre eles e o uso de fibras vegetais, tais como fibras do mesocarpo de coco-da-baía e epicarpo de coco babaçu estão sendo estudadas nesta pesquisa, para que se aprimorem as propriedades destas matrizes poliméricas, tendo em vista também os processos físicos e químicos usados nestas fibras de forma que suas dimensões sejam adequadas e que a relação fibra-matriz seja aprimorada. Outro fato importante a se estudar na elaboração dos biopolímeros é a escolha dos plastificantes. Nos polissacarídeos, por exemplo, os plastificantes mais utilizados são os polióis (como o glicerol - G). Esses plastificantes tornam os biopolímeros mais hidrofílicos o que pode contribuir para aumentar a permeabilidade à água e a susceptibilidade da matriz à umidade do ambiente. Como alternativa, estão os plastificantes hidrofóbicos (como o citrato de tributila - CT), que irão ajudar a reduzir esse comportamento. Assim, este trabalho tem como objetivo elaborar e caracterizar biopolímeros de alginato de sódio com diferentes plastificantes e o uso da pectina, alginato e mesocarpo de coco babaçu como compostos base com incorporação de fibras vegetais naturais como mesocarpo de coco-da-baía e epicarpo de coco babaçu, a fim de conferir boa resistência mecânica, térmica, física e baixa tendência de lixiviação/solubilização. Os biopolímeros foram confeccionados segundo a técnica casting, na qual uma solução filmogênica foi preparada e vertida sobre um suporte, posteriormente levado à secagem e armazenados à umidade relativa de 52%. Os biopolímeros de alginato plastificados com G foram mais higroscópicos do que os com CT ou com misturas de CT/G. O plastificante CT tornou os biopolímeros insolúveis em água e com melhores propriedades mecânicas. As isotermas de sorção foram bem ajustadas ao modelo GAB, apresentando R2 próximo de 1 e baixo desvio médio relativo. Todos os biopolímeros apresentaram um único pico de Tg acentuado, mostrando valores mais altos na presença de CT. No artigo de pectina com as fibras do mesocarpo de coco-da-baía, foram aplicados dois planejamentos experimentais para o tratamento das fibras (fibras in natura e tratadas quimicamente com NaOH 5% - m/m). O tratamento químico mostrou-se eficiente na remoção parcial da hemicelulose e lignina das fibras, com diminuição dos picos em ~1700 cm-1 relacionado a estas substâncias; as fibras ocasionaram filmes mais estáveis a solubilização e lixiviação. As formulações com 9 g de pectina/2 g de fibras e 5 g de pectina/0,5 g de fibras foram recomendadas como sendo as condições selecionadas. Os biopolímeros formulados com 9 g de pectina/2 g de fibras, apresentaram os melhores resultados nas propriedades de tensão e alongamento na ruptura (2,35 MPa e 7,31%, respectivamente) para as fibras tratadas. No artigo de alginato com mesocarpo e fibras de epicarpo de coco babaçu foi aplicado um planejamento experimental de misturas, na qual foram selecionadas as formulações 11 e 13. Estas formulações foram submetidas a uma segunda etapa de reticulação que confirmaram que o material tinha baixa tendência a absorção de água e microestrutura compacta e relativamente homogênea, quanto ao conteúdo de fibras. As melhores formulações têm potencial para serem aplicadas a testes pilotos e produzidas industrialmente.Submitted by Sheila MONTEIRO (sheila.monteiro@ufma.br) on 2020-01-27T14:28:33Z No. of bitstreams: 1 LOURYVAL-PAIXÃO.pdf: 4009755 bytes, checksum: 6ccefbb87c6a23885496c3cf263da1d0 (MD5)Made available in DSpace on 2020-01-27T14:28:33Z (GMT). No. of bitstreams: 1 LOURYVAL-PAIXÃO.pdf: 4009755 bytes, checksum: 6ccefbb87c6a23885496c3cf263da1d0 (MD5) Previous issue date: 2019-12-16Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico do Maranhão – FAPEMAConselho Nacional de Desenvolvimento Científico e Tecnológico – CNPqapplication/pdfporUniversidade Federal do MaranhãoPROGRAMA DE PÓS-GRADUAÇÃO EM BIOTECNOLOGIA - RENORBIO/CCBSUFMABrasilDEPARTAMENTO DE ENGENHARIA DA ELETRICIDADE/CCETAlginatoPectinaMesocarpo de coco babaçuFibras vegetaisPropriedades mecânicas, físicas e térmicasAlginatePectinBabassu coconut mesocarpVegetable fibersMechanical, physical and thermal propertiesMateriais não MetálicosBiopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetaisBiopolymers synthesized with mesocarp from Attalea Speciosa Mart. ex Spreng and vegetable fibersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFMAinstname:Universidade Federal do Maranhão (UFMA)instacron:UFMAORIGINALLOURYVAL-PAIXÃO.pdfLOURYVAL-PAIXÃO.pdfapplication/pdf4009755http://tedebc.ufma.br:8080/bitstream/tede/3011/2/LOURYVAL-PAIX%C3%83O.pdf6ccefbb87c6a23885496c3cf263da1d0MD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82255http://tedebc.ufma.br:8080/bitstream/tede/3011/1/license.txt97eeade1fce43278e63fe063657f8083MD51tede/30112020-01-27 11:28:33.109oai:tede2: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Biblioteca Digital de Teses e Dissertaçõeshttps://tedebc.ufma.br/jspui/PUBhttp://tedebc.ufma.br:8080/oai/requestrepositorio@ufma.br||repositorio@ufma.bropendoar:21312020-01-27T14:28:33Biblioteca Digital de Teses e Dissertações da UFMA - Universidade Federal do Maranhão (UFMA)false
dc.title.por.fl_str_mv Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
dc.title.alternative.eng.fl_str_mv Biopolymers synthesized with mesocarp from Attalea Speciosa Mart. ex Spreng and vegetable fibers
title Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
spellingShingle Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
PAIXÃO, Louryval Coelho
Alginato
Pectina
Mesocarpo de coco babaçu
Fibras vegetais
Propriedades mecânicas, físicas e térmicas
Alginate
Pectin
Babassu coconut mesocarp
Vegetable fibers
Mechanical, physical and thermal properties
Materiais não Metálicos
title_short Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
title_full Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
title_fullStr Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
title_full_unstemmed Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
title_sort Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais
author PAIXÃO, Louryval Coelho
author_facet PAIXÃO, Louryval Coelho
author_role author
dc.contributor.advisor1.fl_str_mv BARROS FILHO, Allan Kardec D.
dc.contributor.advisor1ID.fl_str_mv 340225893-53
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/0492330410079141
dc.contributor.advisor-co1.fl_str_mv SANTANA, Audirene Amorim
dc.contributor.advisor-co1ID.fl_str_mv 880372743-49
dc.contributor.advisor-co1Lattes.fl_str_mv http://lattes.cnpq.br/7431678688628387
dc.contributor.referee1.fl_str_mv BARROS FILHO, Allan Kardec D.
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/0492330410079141
dc.contributor.referee2.fl_str_mv BORGES, Antônio Carlos Romão
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/4315209704773266
dc.contributor.referee3.fl_str_mv CRUZ, Glauber
dc.contributor.referee3Lattes.fl_str_mv http://lattes.cnpq.br/5194234696644344
dc.contributor.referee4.fl_str_mv BORGES, Ferdinando Marco Rodrigues
dc.contributor.referee4Lattes.fl_str_mv http://lattes.cnpq.br/6492640007982658
dc.contributor.referee5.fl_str_mv MOUCHREK FILHO, Victor Elias
dc.contributor.referee5Lattes.fl_str_mv http://lattes.cnpq.br/2381183158978639
dc.contributor.authorID.fl_str_mv 833829173-00
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/8697027182338512
dc.contributor.author.fl_str_mv PAIXÃO, Louryval Coelho
contributor_str_mv BARROS FILHO, Allan Kardec D.
SANTANA, Audirene Amorim
BARROS FILHO, Allan Kardec D.
BORGES, Antônio Carlos Romão
CRUZ, Glauber
BORGES, Ferdinando Marco Rodrigues
MOUCHREK FILHO, Victor Elias
dc.subject.por.fl_str_mv Alginato
Pectina
Mesocarpo de coco babaçu
Fibras vegetais
Propriedades mecânicas, físicas e térmicas
topic Alginato
Pectina
Mesocarpo de coco babaçu
Fibras vegetais
Propriedades mecânicas, físicas e térmicas
Alginate
Pectin
Babassu coconut mesocarp
Vegetable fibers
Mechanical, physical and thermal properties
Materiais não Metálicos
dc.subject.eng.fl_str_mv Alginate
Pectin
Babassu coconut mesocarp
Vegetable fibers
Mechanical, physical and thermal properties
dc.subject.cnpq.fl_str_mv Materiais não Metálicos
description Plastic materials are not always safe or environmentally friendly. Alternatively to these materials are biopolymers, which are polymers derived from living organisms or synthesized from renewable resources such as polysaccharides, proteins and lipids. These materials include babassu coconut mesocarp alginate, pectin and starch. Although these materials have promising application in the production of biopolymers, they are completely soluble in water, with high leaching tendency and low mechanical resistance. The combination of these and the use of plant fibers, such as fibers from the coconut of the bay-coconut and babassu coconut epicarp are being studied in this research, in order to improve the properties of these polymeric matrices, also considering the physical processes. and chemicals used in these fibers so that their dimensions are adequate and the fiber-to-matrix ratio is improved. Another important fact to study in the elaboration of biopolymers is the choice of plasticizers. In polysaccharides, for example, the most commonly used plasticizers are polyols (such as glycerol - G). These plasticizers make biopolymers more hydrophilic which may contribute to increase the water permeability and the susceptibility of the matrix to the humidity of the environment. Alternatively, hydrophobic plasticizers (such as tributyl citrate - CT) will help reduce this behavior. Thus, this work aims to elaborate and characterize sodium alginate biopolymers with different plasticizers and the use of coconut babassu pectin, alginate and mesocarp as base compounds with incorporation of natural plant fibers such as coconut-bay mesocarp and epicarp of babassu coconut in order to provide good mechanical, thermal, physical resistance and low leaching/solubilization tendency. The biopolymers were made according to the casting technique, in which a filmogenic solution was prepared and poured on a support, subsequently dried and stored at a relative humidity of 52%. G-plasticized alginate biopolymers were more hygroscopic than those with CT or CT / G mixtures. Plasticizer CT has made the water-soluble biopolymers with better mechanical properties. Sorption isotherms were well adjusted to the GAB model, with R2 close to 1 and low relative mean deviation. All biopolymers showed a single sharp Tg peak, showing higher values in the presence of CT. In the article of pectin with the fibers of the coconut from the bay of coconut, two experimental designs were applied for the treatment of the fibers (in natura fibers and chemically treated with 5% NaOH - m/m). The chemical treatment was efficient to partially remove hemicellulose and lignin from the fibers, with peaks reduction of ~ 1700 cm-1 related to these substances; the fibers caused more stable films to solubilization and leaching. Formulations with 9 g pectin/2 g fiber and 5 g pectin/0.5 g fiber were recommended as the selected conditions. Biopolymers formulated with 9 g of pectin/2 g of fibers showed the best results in tensile strength and elongation at break (2.35 MPa and 7.31%, respectively) for the treated fibers. In the mesocarp alginate article with babassu coconut epicarp fibers an experimental design of mixtures was applied, in which formulations 11 and 13 were selected. These formulations were subjected to a second cross-linking step which confirmed that the material had a low tendency to water absorption and compact and relatively homogeneous microstructure for fiber content. The best formulations have the potential to be applied to pilot tests and industrially produced.
publishDate 2019
dc.date.issued.fl_str_mv 2019-12-16
dc.date.accessioned.fl_str_mv 2020-01-27T14:28:33Z
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.citation.fl_str_mv PAIXÃO, Louryval Coelho. Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais. 2019. 146 f. Tese (Programa de Pós-Graduação em Biotecnologia - Renorbio/CCBS) - Universidade Federal do Maranhão, São Luís, 2019.
dc.identifier.uri.fl_str_mv https://tedebc.ufma.br/jspui/handle/tede/tede/3011
identifier_str_mv PAIXÃO, Louryval Coelho. Biopolímeros sintetizados com mesocarpo de Attalea Speciosa Mart. ex Spreng e fibras vegetais. 2019. 146 f. Tese (Programa de Pós-Graduação em Biotecnologia - Renorbio/CCBS) - Universidade Federal do Maranhão, São Luís, 2019.
url https://tedebc.ufma.br/jspui/handle/tede/tede/3011
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language por
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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dc.publisher.none.fl_str_mv Universidade Federal do Maranhão
dc.publisher.program.fl_str_mv PROGRAMA DE PÓS-GRADUAÇÃO EM BIOTECNOLOGIA - RENORBIO/CCBS
dc.publisher.initials.fl_str_mv UFMA
dc.publisher.country.fl_str_mv Brasil
dc.publisher.department.fl_str_mv DEPARTAMENTO DE ENGENHARIA DA ELETRICIDADE/CCET
publisher.none.fl_str_mv Universidade Federal do Maranhão
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações da UFMA
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instacron:UFMA
instname_str Universidade Federal do Maranhão (UFMA)
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