Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6
Main Author: | |
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Publication Date: | 2016 |
Format: | Master thesis |
Language: | por |
Source: | Repositório Institucional da UFSCAR |
Download full: | https://repositorio.ufscar.br/handle/ufscar/8160 |
Summary: | Aramid fibers are very known by their excellent combination of tensile strength and elastic modulus with low density. On the other hand, aramids do not melt which difficult the recycling process. This property is an important issue for many companies that work with these materials since thousands of tons of aramid fibers are produced each year and there are just a few reutilization alternatives. This project evaluated a new alternative to reuse aramid fibers from industrial waste as mechanical reinforcement for polyamide 6,6. Another important characteristic of these fibers is the low interaction with polymeric matrices due to its intrinsic molecular stability and to finishing products that facilitates the spinning and weaving processes. In order to remove the finishing, the fibers were washed with methanol and hexane, but the hexane washed fibers showed better results. Surface treatments with NaOH solutions were also evaluated. It was reported in XPS results that NaOH solution hydrolyzed the fiber’s surface. However, conditions with higher NaOH concentration were too aggressive to the fiber’s mechanical properties. For this reason, it was selected two procedures: 2% NaOH at 30 minutes of exposure and 6% NaOH at 45 minutes of exposure. The composites were produced with two different fiber’s weight concentration, 5 and 10%. The results have shown that the surface treatment impacted the interfacial adhesion, but there was no increase on the composite’s mechanical properties due to the fiber’s mechanical damage caused by the treatment. The addition of 5% of fibers did not increase the mechanical properties probably due to the fact that 5% is near to the fiber’s critical volume for this composite. The composites with 10% of fibers showed better results and revealed a great potential for this reuse alternative for para-aramid fibers. |
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Loureiro, LucasBettini, Sílvia Helena Pradohttp://lattes.cnpq.br/3687551763124327http://lattes.cnpq.br/30450301770142452016-10-21T13:54:17Z2016-10-21T13:54:17Z2016-06-09LOUREIRO, Lucas. Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6. 2016. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2016. Disponível em: https://repositorio.ufscar.br/handle/ufscar/8160.https://repositorio.ufscar.br/handle/ufscar/8160Aramid fibers are very known by their excellent combination of tensile strength and elastic modulus with low density. On the other hand, aramids do not melt which difficult the recycling process. This property is an important issue for many companies that work with these materials since thousands of tons of aramid fibers are produced each year and there are just a few reutilization alternatives. This project evaluated a new alternative to reuse aramid fibers from industrial waste as mechanical reinforcement for polyamide 6,6. Another important characteristic of these fibers is the low interaction with polymeric matrices due to its intrinsic molecular stability and to finishing products that facilitates the spinning and weaving processes. In order to remove the finishing, the fibers were washed with methanol and hexane, but the hexane washed fibers showed better results. Surface treatments with NaOH solutions were also evaluated. It was reported in XPS results that NaOH solution hydrolyzed the fiber’s surface. However, conditions with higher NaOH concentration were too aggressive to the fiber’s mechanical properties. For this reason, it was selected two procedures: 2% NaOH at 30 minutes of exposure and 6% NaOH at 45 minutes of exposure. The composites were produced with two different fiber’s weight concentration, 5 and 10%. The results have shown that the surface treatment impacted the interfacial adhesion, but there was no increase on the composite’s mechanical properties due to the fiber’s mechanical damage caused by the treatment. The addition of 5% of fibers did not increase the mechanical properties probably due to the fact that 5% is near to the fiber’s critical volume for this composite. The composites with 10% of fibers showed better results and revealed a great potential for this reuse alternative for para-aramid fibers.Fibras de aramida são conhecidas devido as suas excelentes propriedades de resistência à tração e módulo elástico aliados à baixa densidade; entretanto, este polímero não funde, inviabilizando a sua reciclagem mecânica. Tendo em vista a importância e potencialidade de tais fibras, este projeto avaliou a viabilidade técnica em reutilizá-las como reforço mecânico de poliamida 6,6. Ao mesmo tempo, as fibras de para-aramida possuem como característica baixa interação com matrizes poliméricas, tanto por sua intrínseca estabilidade molecular quanto por possíveis revestimentos que facilitam os processos de fiação e tecelagem. Para eliminar esses revestimentos, foram realizados procedimentos de lavagem com metanol e hexano, sendo o hexano apresentou maiores interferências na superfície das fibras, e foi escolhido para a produção dos compósitos. Com o intuito de aumentar a interação química entre fibra e matriz, foram realizados procedimentos de tratamento químico superficial com soluções de hidróxido de sódio (NaOH). Os resultados de XPS indicaram que a superfície da fibra foi hidrolisada, sendo que as condições de tratamento com maiores concentrações de NaOH se mostraram mais agressivas às propriedades mecânicas das fibras. Por este motivo, foram selecionados dois procedimentos de tratamento químico para a modificação das fibras e produção dos compósitos: 2% NaOH e 30 minutos de exposição e 6% NaOH e 45 minutos de exposição. Foram produzidos compósitos com 5 e 10% em massa de fibras de para-aramida. Os resultados obtidos indicaram que a lavagem não alterou a adesão interfacial e nem as propriedades mecânicas. Por outro lado, os tratamentos químicos alteraram a adesão interacial, porém não demonstraram melhorias nas propriedades mecânicas dos compósitos, justificadas pelo efeitos deletérios do tratamento químico nas propriedades mecânicas das fibras. Em termos gerais, observou-se pouca influência na adição de 5% de fibra, enquanto que os compósitos com 10% de fibra apresentaram melhores resultados. Sendo assim, o presente estudo demonstrou que há potencial para esta via de reutilização das fibras de para-aramida.Não recebi financiamentoporUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarFibras de aramidaReciclagemPoliamida 6,6CompósitoAramid fiberRecyclingPolyamide 6,6CompositeCIENCIAS EXATAS E DA TERRAENGENHARIASReutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6Reuse of para-aramid fibers as a mechanical reinforcement filler in polyamide 6,6 matrixinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOnlineinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALDissLL.pdfDissLL.pdfapplication/pdf5592723https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/8160/1/DissLL.pdfc5744bd4292b99c4b6727f7625773835MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81957https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/8160/2/license.txtae0398b6f8b235e40ad82cba6c50031dMD52TEXTDissLL.pdf.txtDissLL.pdf.txtExtracted texttext/plain157918https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/8160/3/DissLL.pdf.txt2fa85ecfa056c501f1a4e7ff3c00dc21MD53THUMBNAILDissLL.pdf.jpgDissLL.pdf.jpgIM Thumbnailimage/jpeg6070https://{{ getenv "DSPACE_HOST" "repositorio.ufscar.br" }}/bitstream/ufscar/8160/4/DissLL.pdf.jpge0a1e6076f17e19b8a4bb0e0ba607f60MD54ufscar/81602019-09-11 02:35:19.094oai:repositorio.ufscar.br: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Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222019-09-11T02:35:19Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 |
dc.title.alternative.eng.fl_str_mv |
Reuse of para-aramid fibers as a mechanical reinforcement filler in polyamide 6,6 matrix |
title |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 |
spellingShingle |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 Loureiro, Lucas Fibras de aramida Reciclagem Poliamida 6,6 Compósito Aramid fiber Recycling Polyamide 6,6 Composite CIENCIAS EXATAS E DA TERRA ENGENHARIAS |
title_short |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 |
title_full |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 |
title_fullStr |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 |
title_full_unstemmed |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 |
title_sort |
Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6 |
author |
Loureiro, Lucas |
author_facet |
Loureiro, Lucas |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/3045030177014245 |
dc.contributor.author.fl_str_mv |
Loureiro, Lucas |
dc.contributor.advisor1.fl_str_mv |
Bettini, Sílvia Helena Prado |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/3687551763124327 |
contributor_str_mv |
Bettini, Sílvia Helena Prado |
dc.subject.por.fl_str_mv |
Fibras de aramida Reciclagem Poliamida 6,6 Compósito Aramid fiber |
topic |
Fibras de aramida Reciclagem Poliamida 6,6 Compósito Aramid fiber Recycling Polyamide 6,6 Composite CIENCIAS EXATAS E DA TERRA ENGENHARIAS |
dc.subject.eng.fl_str_mv |
Recycling Polyamide 6,6 Composite |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA ENGENHARIAS |
description |
Aramid fibers are very known by their excellent combination of tensile strength and elastic modulus with low density. On the other hand, aramids do not melt which difficult the recycling process. This property is an important issue for many companies that work with these materials since thousands of tons of aramid fibers are produced each year and there are just a few reutilization alternatives. This project evaluated a new alternative to reuse aramid fibers from industrial waste as mechanical reinforcement for polyamide 6,6. Another important characteristic of these fibers is the low interaction with polymeric matrices due to its intrinsic molecular stability and to finishing products that facilitates the spinning and weaving processes. In order to remove the finishing, the fibers were washed with methanol and hexane, but the hexane washed fibers showed better results. Surface treatments with NaOH solutions were also evaluated. It was reported in XPS results that NaOH solution hydrolyzed the fiber’s surface. However, conditions with higher NaOH concentration were too aggressive to the fiber’s mechanical properties. For this reason, it was selected two procedures: 2% NaOH at 30 minutes of exposure and 6% NaOH at 45 minutes of exposure. The composites were produced with two different fiber’s weight concentration, 5 and 10%. The results have shown that the surface treatment impacted the interfacial adhesion, but there was no increase on the composite’s mechanical properties due to the fiber’s mechanical damage caused by the treatment. The addition of 5% of fibers did not increase the mechanical properties probably due to the fact that 5% is near to the fiber’s critical volume for this composite. The composites with 10% of fibers showed better results and revealed a great potential for this reuse alternative for para-aramid fibers. |
publishDate |
2016 |
dc.date.accessioned.fl_str_mv |
2016-10-21T13:54:17Z |
dc.date.available.fl_str_mv |
2016-10-21T13:54:17Z |
dc.date.issued.fl_str_mv |
2016-06-09 |
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 |
LOUREIRO, Lucas. Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6. 2016. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2016. Disponível em: https://repositorio.ufscar.br/handle/ufscar/8160. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/8160 |
identifier_str_mv |
LOUREIRO, Lucas. Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6. 2016. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2016. Disponível em: https://repositorio.ufscar.br/handle/ufscar/8160. |
url |
https://repositorio.ufscar.br/handle/ufscar/8160 |
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por |
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por |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
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 |
dc.publisher.initials.fl_str_mv |
UFSCar |
publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.source.none.fl_str_mv |
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UFSCAR |
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UFSCAR |
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Repositório Institucional da UFSCAR |
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