Chemical modification effect on the mechanical properties of hips/ coconut fiber composites

Detalhes bibliográficos
Autor(a) principal: Carvalho, Kelly C.C. [UNESP]
Data de Publicação: 2010
Outros Autores: Mulinari, Daniella R. [UNESP], Voorwald, Herman J.C. [UNESP], Cioffi, Maria O.H. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/226018
Resumo: Lignocellulosic fibers from green coconut fruit were treated with alkaline solution (NaOH 10%m/v) and then bleached with sodium chlorite (NaClO2) and acetic acid (CH3COOH). Alkali-treated and bleached fibers were mixed with high impact polystyrene (HIPS) and placed in an injector chamber in order to obtain specimens for tensile tests. Specimens of HIPS/alkali-treated and bleached coconut fiber composites were tested in tensile mode, and the fracture surfaces of the composites were analyzed by scanning electron microscopy. Untreated, alkali-treated, and bleached coconut fibers were analyzed by scanning electron microscopy and X-ray diffraction. Alkaline treatment was effective for removing the extractives and increasing the roughness of surfaces, while the bleaching treatment intensified the effect of alkaline treatment, while increasing the crystallinity index and surface energy of fibers. Results of tensile tests showed that the addition of 30% alkali-treated and bleached fibers reinforcing the HIPS matrix provided considerable changes in the mechanical properties of composites in comparison with the pure HIPS. On the other hand, chemical treatments were not totally effective for improving the adhesion between the fiber and matrix, as was observed in the analysis of the fracture surfaces of composites materials.
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spelling Chemical modification effect on the mechanical properties of hips/ coconut fiber compositesInjection mouldingLignocellulosic fiberMechanical propertiesPolymer-matrix compositesLignocellulosic fibers from green coconut fruit were treated with alkaline solution (NaOH 10%m/v) and then bleached with sodium chlorite (NaClO2) and acetic acid (CH3COOH). Alkali-treated and bleached fibers were mixed with high impact polystyrene (HIPS) and placed in an injector chamber in order to obtain specimens for tensile tests. Specimens of HIPS/alkali-treated and bleached coconut fiber composites were tested in tensile mode, and the fracture surfaces of the composites were analyzed by scanning electron microscopy. Untreated, alkali-treated, and bleached coconut fibers were analyzed by scanning electron microscopy and X-ray diffraction. Alkaline treatment was effective for removing the extractives and increasing the roughness of surfaces, while the bleaching treatment intensified the effect of alkaline treatment, while increasing the crystallinity index and surface energy of fibers. Results of tensile tests showed that the addition of 30% alkali-treated and bleached fibers reinforcing the HIPS matrix provided considerable changes in the mechanical properties of composites in comparison with the pure HIPS. On the other hand, chemical treatments were not totally effective for improving the adhesion between the fiber and matrix, as was observed in the analysis of the fracture surfaces of composites materials.Department of Materials and Technology UNESP-Univ Estadual Paulista, Guaratinguetá/SPDepartment of Materials and Technology UNESP-Univ Estadual Paulista, Guaratinguetá/SPUniversidade Estadual Paulista (UNESP)Carvalho, Kelly C.C. [UNESP]Mulinari, Daniella R. [UNESP]Voorwald, Herman J.C. [UNESP]Cioffi, Maria O.H. [UNESP]2022-04-28T21:24:23Z2022-04-28T21:24:23Z2010-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1143-1155BioResources, v. 5, n. 2, p. 1143-1155, 2010.1930-2126http://hdl.handle.net/11449/2260182-s2.0-77956070762Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBioResourcesinfo:eu-repo/semantics/openAccess2022-04-28T21:24:23Zoai:repositorio.unesp.br:11449/226018Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T21:24:23Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
title Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
spellingShingle Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
Carvalho, Kelly C.C. [UNESP]
Injection moulding
Lignocellulosic fiber
Mechanical properties
Polymer-matrix composites
title_short Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
title_full Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
title_fullStr Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
title_full_unstemmed Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
title_sort Chemical modification effect on the mechanical properties of hips/ coconut fiber composites
author Carvalho, Kelly C.C. [UNESP]
author_facet Carvalho, Kelly C.C. [UNESP]
Mulinari, Daniella R. [UNESP]
Voorwald, Herman J.C. [UNESP]
Cioffi, Maria O.H. [UNESP]
author_role author
author2 Mulinari, Daniella R. [UNESP]
Voorwald, Herman J.C. [UNESP]
Cioffi, Maria O.H. [UNESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
dc.contributor.author.fl_str_mv Carvalho, Kelly C.C. [UNESP]
Mulinari, Daniella R. [UNESP]
Voorwald, Herman J.C. [UNESP]
Cioffi, Maria O.H. [UNESP]
dc.subject.por.fl_str_mv Injection moulding
Lignocellulosic fiber
Mechanical properties
Polymer-matrix composites
topic Injection moulding
Lignocellulosic fiber
Mechanical properties
Polymer-matrix composites
description Lignocellulosic fibers from green coconut fruit were treated with alkaline solution (NaOH 10%m/v) and then bleached with sodium chlorite (NaClO2) and acetic acid (CH3COOH). Alkali-treated and bleached fibers were mixed with high impact polystyrene (HIPS) and placed in an injector chamber in order to obtain specimens for tensile tests. Specimens of HIPS/alkali-treated and bleached coconut fiber composites were tested in tensile mode, and the fracture surfaces of the composites were analyzed by scanning electron microscopy. Untreated, alkali-treated, and bleached coconut fibers were analyzed by scanning electron microscopy and X-ray diffraction. Alkaline treatment was effective for removing the extractives and increasing the roughness of surfaces, while the bleaching treatment intensified the effect of alkaline treatment, while increasing the crystallinity index and surface energy of fibers. Results of tensile tests showed that the addition of 30% alkali-treated and bleached fibers reinforcing the HIPS matrix provided considerable changes in the mechanical properties of composites in comparison with the pure HIPS. On the other hand, chemical treatments were not totally effective for improving the adhesion between the fiber and matrix, as was observed in the analysis of the fracture surfaces of composites materials.
publishDate 2010
dc.date.none.fl_str_mv 2010-05-01
2022-04-28T21:24:23Z
2022-04-28T21:24:23Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv BioResources, v. 5, n. 2, p. 1143-1155, 2010.
1930-2126
http://hdl.handle.net/11449/226018
2-s2.0-77956070762
identifier_str_mv BioResources, v. 5, n. 2, p. 1143-1155, 2010.
1930-2126
2-s2.0-77956070762
url http://hdl.handle.net/11449/226018
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv BioResources
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1143-1155
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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