Influence of mild alkaline treatment on the cellulosic surfaces active sites
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/3351 |
Resumo: | Agro-residues fibers are inexpensive environmentally friendly alternatives to synthetic fibers in fiber reinforced polymer composites. The natural fiber properties and bondability with adhesive can be modified by subjecting the fibers to a pre-treatment procedure. The knowledge ofthe modified fibers sur face properties is essential to explain and predict their applications. The present study is focused on the effect of alkaline treatment on the surface characteristics of stalk fibers from rapeseed, tobacco, cotton, lemon balm and kiwi. The chemical composition of fibers and Fourier transform infrared spectroscopy show components extraction and the X-ray diffraction show improvement in the crystallinity index of the treated fibers. But only the IGC analysis allows us to know in detail the alterations on the fiber surface and the effect on the adhesion of the fibers. IGC shows that alkaline treatment produces changes in the nature and number of the active sites, responsible for the physico-chemical activity of the surface of the fibers. The fiber hydrophobicity was improved by the increase of more energetic and active sites in the surface. Also,the creation of new basic active sites and removal of acidic active sites from the fiber surface due to alkaline treatment has been clearly shown. |
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Influence of mild alkaline treatment on the cellulosic surfaces active sitesAgro-residues fibersAlkaline treatmentInverse gas chromatographySurface properties.Faculdade de Ciências Exatas e da EngenhariaAgro-residues fibers are inexpensive environmentally friendly alternatives to synthetic fibers in fiber reinforced polymer composites. The natural fiber properties and bondability with adhesive can be modified by subjecting the fibers to a pre-treatment procedure. The knowledge ofthe modified fibers sur face properties is essential to explain and predict their applications. The present study is focused on the effect of alkaline treatment on the surface characteristics of stalk fibers from rapeseed, tobacco, cotton, lemon balm and kiwi. The chemical composition of fibers and Fourier transform infrared spectroscopy show components extraction and the X-ray diffraction show improvement in the crystallinity index of the treated fibers. But only the IGC analysis allows us to know in detail the alterations on the fiber surface and the effect on the adhesion of the fibers. IGC shows that alkaline treatment produces changes in the nature and number of the active sites, responsible for the physico-chemical activity of the surface of the fibers. The fiber hydrophobicity was improved by the increase of more energetic and active sites in the surface. Also,the creation of new basic active sites and removal of acidic active sites from the fiber surface due to alkaline treatment has been clearly shown.ElsevierDigitUMaAshori, AlirezaOrnelas, MarianaSheshmani, ShabnamCordeiro, Nereida2021-05-04T08:49:22Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/3351engAshori, A., Ornelas, M., Sheshmani, S., & Cordeiro, N. (2012). Influence of mild alkaline treatment on the cellulosic surfaces active sites. Carbohydrate polymers, 88(4), 1293-1298.10.1016/j.carbpol.2012.02.008info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-19T05:34:45Zoai:digituma.uma.pt:10400.13/3351Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:06:24.117117Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Influence of mild alkaline treatment on the cellulosic surfaces active sites |
title |
Influence of mild alkaline treatment on the cellulosic surfaces active sites |
spellingShingle |
Influence of mild alkaline treatment on the cellulosic surfaces active sites Ashori, Alireza Agro-residues fibers Alkaline treatment Inverse gas chromatography Surface properties . Faculdade de Ciências Exatas e da Engenharia |
title_short |
Influence of mild alkaline treatment on the cellulosic surfaces active sites |
title_full |
Influence of mild alkaline treatment on the cellulosic surfaces active sites |
title_fullStr |
Influence of mild alkaline treatment on the cellulosic surfaces active sites |
title_full_unstemmed |
Influence of mild alkaline treatment on the cellulosic surfaces active sites |
title_sort |
Influence of mild alkaline treatment on the cellulosic surfaces active sites |
author |
Ashori, Alireza |
author_facet |
Ashori, Alireza Ornelas, Mariana Sheshmani, Shabnam Cordeiro, Nereida |
author_role |
author |
author2 |
Ornelas, Mariana Sheshmani, Shabnam Cordeiro, Nereida |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Ashori, Alireza Ornelas, Mariana Sheshmani, Shabnam Cordeiro, Nereida |
dc.subject.por.fl_str_mv |
Agro-residues fibers Alkaline treatment Inverse gas chromatography Surface properties . Faculdade de Ciências Exatas e da Engenharia |
topic |
Agro-residues fibers Alkaline treatment Inverse gas chromatography Surface properties . Faculdade de Ciências Exatas e da Engenharia |
description |
Agro-residues fibers are inexpensive environmentally friendly alternatives to synthetic fibers in fiber reinforced polymer composites. The natural fiber properties and bondability with adhesive can be modified by subjecting the fibers to a pre-treatment procedure. The knowledge ofthe modified fibers sur face properties is essential to explain and predict their applications. The present study is focused on the effect of alkaline treatment on the surface characteristics of stalk fibers from rapeseed, tobacco, cotton, lemon balm and kiwi. The chemical composition of fibers and Fourier transform infrared spectroscopy show components extraction and the X-ray diffraction show improvement in the crystallinity index of the treated fibers. But only the IGC analysis allows us to know in detail the alterations on the fiber surface and the effect on the adhesion of the fibers. IGC shows that alkaline treatment produces changes in the nature and number of the active sites, responsible for the physico-chemical activity of the surface of the fibers. The fiber hydrophobicity was improved by the increase of more energetic and active sites in the surface. Also,the creation of new basic active sites and removal of acidic active sites from the fiber surface due to alkaline treatment has been clearly shown. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012 2012-01-01T00:00:00Z 2021-05-04T08:49:22Z |
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 |
http://hdl.handle.net/10400.13/3351 |
url |
http://hdl.handle.net/10400.13/3351 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Ashori, A., Ornelas, M., Sheshmani, S., & Cordeiro, N. (2012). Influence of mild alkaline treatment on the cellulosic surfaces active sites. Carbohydrate polymers, 88(4), 1293-1298. 10.1016/j.carbpol.2012.02.008 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799129934532182016 |