Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados

The coconut palm (Cocos nucifera L) is a common plant in Brazilian northeastern coast and its consumption has generated huge amounts of residues and other environmental problems, such as high demand for disposal area and negative visual impact caused in cities. The utilization outlook of these rubbi...

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Autor principal: Santiago, Pedro Victor Teixeira
Outros Autores: Dantas, Tereza Neuma de Castro
Formato: bachelorThesis
Idioma:pt_BR
Publicado em: Universidade Federal do Rio Grande do Norte
Assuntos:
Fibra de coco
Tratamento químico
Microemulsão
Caracterização
Microemulsion
Chemical treatment
Characterization
Coconut fiber
Engenharias.
Endereço do item:https://repositorio.ufrn.br/handle/123456789/38718
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id ri-123456789-38718
record_format dspace
institution Repositório Institucional
collection RI - UFRN
language pt_BR
topic Fibra de coco
Tratamento químico
Microemulsão
Caracterização
Microemulsion
Chemical treatment
Characterization
Coconut fiber
Engenharias.
spellingShingle Fibra de coco
Tratamento químico
Microemulsão
Caracterização
Microemulsion
Chemical treatment
Characterization
Coconut fiber
Engenharias.
Santiago, Pedro Victor Teixeira
Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados
description The coconut palm (Cocos nucifera L) is a common plant in Brazilian northeastern coast and its consumption has generated huge amounts of residues and other environmental problems, such as high demand for disposal area and negative visual impact caused in cities. The utilization outlook of these rubbish, as the coconut fiber, has been changing due to environmental concern and the price rise of other raw materials, as synthetic fibers. In many of the new applications found for coconut fiber, the fiber undergoes a chemical treatment, justified by multiple reasons, such as improve fiber interaction with another component or change any physical property. In this work, a new type of chemical treatment using microemulsion systems was studied. The fibers treatment was held with three micellar structure types, observing the changes in the fibers structures through characterization tests as scanning electron microscopy, thermogravimetric analysis and contact angle analysis (wettability check). Therefore, a 32 full factorial design was carried out varying the treatment time and the microemulsion oil phase concentration aiming to verify these factors influence on the fiber wetting properties. The results showed that the chemical treatment changed the fiber wettability to water-wet as the oil phase increased. The statistical study showed a wettability increase for the fibers in 4 to 6-hour treatment and 30% of oil phase (bicontinuous micelle), being that the treatment optimal point. The results of the scanning electron microscopy showed that the treatment filled the coconut fibers pores. Finally, the thermogravimetric analysis proved that the treatment was very consistent with the studied literature, since it was possible to observe the burning of hemicellulose, lignin and cellulose at different temperatures.
author2 Dantas, Tereza Neuma de Castro
author_facet Dantas, Tereza Neuma de Castro
Santiago, Pedro Victor Teixeira
format bachelorThesis
author Santiago, Pedro Victor Teixeira
author_sort Santiago, Pedro Victor Teixeira
title Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados
title_short Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados
title_full Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados
title_fullStr Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados
title_full_unstemmed Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados
title_sort estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados
publisher Universidade Federal do Rio Grande do Norte
publishDate 2018
url https://repositorio.ufrn.br/handle/123456789/38718
work_keys_str_mv AT santiagopedrovictorteixeira estudodaspropriedadesdasfibrasdecocomodificadascomsistemasmicroemulsionados
_version_ 1773965459301859328
spelling ri-123456789-387182021-09-27T12:19:31Z Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados Santiago, Pedro Victor Teixeira Dantas, Tereza Neuma de Castro Laís Sibaldo Ribeiro Oliveira, Katherine Carrilho de Juviniano, Henrique Borges de Moraes Fibra de coco Tratamento químico Microemulsão Caracterização Microemulsion Chemical treatment Characterization Coconut fiber Engenharias. The coconut palm (Cocos nucifera L) is a common plant in Brazilian northeastern coast and its consumption has generated huge amounts of residues and other environmental problems, such as high demand for disposal area and negative visual impact caused in cities. The utilization outlook of these rubbish, as the coconut fiber, has been changing due to environmental concern and the price rise of other raw materials, as synthetic fibers. In many of the new applications found for coconut fiber, the fiber undergoes a chemical treatment, justified by multiple reasons, such as improve fiber interaction with another component or change any physical property. In this work, a new type of chemical treatment using microemulsion systems was studied. The fibers treatment was held with three micellar structure types, observing the changes in the fibers structures through characterization tests as scanning electron microscopy, thermogravimetric analysis and contact angle analysis (wettability check). Therefore, a 32 full factorial design was carried out varying the treatment time and the microemulsion oil phase concentration aiming to verify these factors influence on the fiber wetting properties. The results showed that the chemical treatment changed the fiber wettability to water-wet as the oil phase increased. The statistical study showed a wettability increase for the fibers in 4 to 6-hour treatment and 30% of oil phase (bicontinuous micelle), being that the treatment optimal point. The results of the scanning electron microscopy showed that the treatment filled the coconut fibers pores. Finally, the thermogravimetric analysis proved that the treatment was very consistent with the studied literature, since it was possible to observe the burning of hemicellulose, lignin and cellulose at different temperatures. ANP O coqueiro (Cocos nucifera L) é uma planta comum na região litorânea do Nordeste brasileiro e o seu consumo tem gerado grandes quantidades de resíduos e outros problemas ambientais, como alta demanda de área para descarte e impacto visual negativo gerado nas cidades. O cenário para aproveitamento desses resíduos, como a fibra de coco, vem mudando tanto pela preocupação ambiental quanto pelo aumento do custo de outras matérias primas, como fibras sintéticas. Em muitas das novas aplicações encontradas para a fibra de coco, elas passam por um tratamento químico, justificado por diversos motivos, como melhorar a interação da fibra com outro componente ou alterar alguma propriedade física. Neste trabalho, foi estudado um novo tipo de tratamento químico utilizando sistemas microemulsionados. Realizou-se o tratamento das fibras com três tipos de estruturas micelares, observando as modificações nas estruturas das fibras por meio de testes de caracterização como microscopia eletrônica de varredura, termogravimetria e molhabilidade. Foi realizado um planejamento experimental fatorial 32 variando o tempo de tratamento e a concentração da fase óleo da microemulsão visando verificar a influência desses fatores na molhabilidade da fibra. Os resultados mostraram que o tratamento químico aumentou a molhabilidade da fibra à água com o aumento da fase oleosa. O estudo estatístico mostrou que com o tratamento de 4 a 6 h e fase oleosa de 30% (micela bicontínua) as fibras aumentaram sua molhabilidade, sendo este o ponto ótimo de tratamento. Para os resultados da microscopia eletrônica de varredura, foi observado que o tratamento preencheu os poros das fibras de coco. Por fim, a análise termogravimétrica se mostrou muito coerente com a literatura estudada, conseguindo-se observar a queima da hemicelulose, lignina e celulose em diferentes temperaturas. 2018-07-05T19:47:01Z 2021-09-27T12:19:31Z 2018-07-05T19:47:01Z 2021-09-27T12:19:31Z 2018-06-14 bachelorThesis 2013015031 SANTIAGO, Pedro Victor Teixeira. Estudo das propriedades das fibras de coco modificadas com sistemas microemulsionados. 2018. 65f. Trabalho de Conclusão de Curso (Graduação em Engenharia Química) - Departamento de Engenharia Química, Universidade Federal do Rio Grande do Norte, Natal, 2018. https://repositorio.ufrn.br/handle/123456789/38718 pt_BR openAccess application/pdf Universidade Federal do Rio Grande do Norte Brasil UFRN Engenharia Química

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