Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts
Autor(a) principal: | |
---|---|
Data de Publicação: | 2011 |
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/10773/5142 |
Resumo: | The surface hydrophobization through heterogeneous chemical modification of bacterial (and vegetable) cellulose fibers with several anhydrides (acetic, butyric, hexanoic and alkenyl succinic anhydrides) and hexanoyl chloride suspended in an ionic liquid, tetradecyltrihexylphosphonium bis(trifluoromethylsulfonyl) imide, [TDTHP][NTf(2)], was studied. Furthermore, in the reaction with hexanoyl chloride, another ionic liquid, N-hexyl-4-(dimethylamino)pyridinium bis(trifluoromethylsulfonyl) imide, [C(6)N(CH(3))(2)py][NTf(2)], was used instead of common organic bases as catalyst and to trap the released HCl. The analysis of the ensuing modified fibers by FTIR, XRD and SEM clearly showed that the esterification reactions occurred essentially at the fibers' outmost layers, not affecting their ultrastructure. The degree of substitution (DS) of the ensuing esterified fibers ranged from less than 0.002 to 0.41; and in all instances, the fibers' surface acquired a high hydrophobicity. This novel approach constitutes an important strategy in the preparation of modified fibers under greener conditions relaying in the use of non-volatile solvents. |
id |
RCAP_ce6e80321eed18de15e2461aa79a179a |
---|---|
oai_identifier_str |
oai:ria.ua.pt:10773/5142 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalystsThe surface hydrophobization through heterogeneous chemical modification of bacterial (and vegetable) cellulose fibers with several anhydrides (acetic, butyric, hexanoic and alkenyl succinic anhydrides) and hexanoyl chloride suspended in an ionic liquid, tetradecyltrihexylphosphonium bis(trifluoromethylsulfonyl) imide, [TDTHP][NTf(2)], was studied. Furthermore, in the reaction with hexanoyl chloride, another ionic liquid, N-hexyl-4-(dimethylamino)pyridinium bis(trifluoromethylsulfonyl) imide, [C(6)N(CH(3))(2)py][NTf(2)], was used instead of common organic bases as catalyst and to trap the released HCl. The analysis of the ensuing modified fibers by FTIR, XRD and SEM clearly showed that the esterification reactions occurred essentially at the fibers' outmost layers, not affecting their ultrastructure. The degree of substitution (DS) of the ensuing esterified fibers ranged from less than 0.002 to 0.41; and in all instances, the fibers' surface acquired a high hydrophobicity. This novel approach constitutes an important strategy in the preparation of modified fibers under greener conditions relaying in the use of non-volatile solvents.Royal Society of Chemistry2012-01-16T17:00:51Z2011-01-01T00:00:00Z2011info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/5142eng1463-926210.1039/C1GC15432JTomé, Liliana C.Freire, Mara G.Rebelo, Luís Paulo N.Silvestre, Armando J. D.Carlos Pascoal NetoMarrucho, Isabel M.Freire, Carmen S. R.info: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:RCAAP2024-02-22T11:06:56Zoai:ria.ua.pt:10773/5142Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:43:04.433132Repositório 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 |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts |
title |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts |
spellingShingle |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts Tomé, Liliana C. |
title_short |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts |
title_full |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts |
title_fullStr |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts |
title_full_unstemmed |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts |
title_sort |
Surface hydrophobization of bacterial and vegetable cellulose fibers using ionic liquids as solvent media and catalysts |
author |
Tomé, Liliana C. |
author_facet |
Tomé, Liliana C. Freire, Mara G. Rebelo, Luís Paulo N. Silvestre, Armando J. D. Carlos Pascoal Neto Marrucho, Isabel M. Freire, Carmen S. R. |
author_role |
author |
author2 |
Freire, Mara G. Rebelo, Luís Paulo N. Silvestre, Armando J. D. Carlos Pascoal Neto Marrucho, Isabel M. Freire, Carmen S. R. |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Tomé, Liliana C. Freire, Mara G. Rebelo, Luís Paulo N. Silvestre, Armando J. D. Carlos Pascoal Neto Marrucho, Isabel M. Freire, Carmen S. R. |
description |
The surface hydrophobization through heterogeneous chemical modification of bacterial (and vegetable) cellulose fibers with several anhydrides (acetic, butyric, hexanoic and alkenyl succinic anhydrides) and hexanoyl chloride suspended in an ionic liquid, tetradecyltrihexylphosphonium bis(trifluoromethylsulfonyl) imide, [TDTHP][NTf(2)], was studied. Furthermore, in the reaction with hexanoyl chloride, another ionic liquid, N-hexyl-4-(dimethylamino)pyridinium bis(trifluoromethylsulfonyl) imide, [C(6)N(CH(3))(2)py][NTf(2)], was used instead of common organic bases as catalyst and to trap the released HCl. The analysis of the ensuing modified fibers by FTIR, XRD and SEM clearly showed that the esterification reactions occurred essentially at the fibers' outmost layers, not affecting their ultrastructure. The degree of substitution (DS) of the ensuing esterified fibers ranged from less than 0.002 to 0.41; and in all instances, the fibers' surface acquired a high hydrophobicity. This novel approach constitutes an important strategy in the preparation of modified fibers under greener conditions relaying in the use of non-volatile solvents. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-01-01T00:00:00Z 2011 2012-01-16T17:00:51Z |
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/10773/5142 |
url |
http://hdl.handle.net/10773/5142 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1463-9262 10.1039/C1GC15432J |
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 |
Royal Society of Chemistry |
publisher.none.fl_str_mv |
Royal Society of Chemistry |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
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 |
|
_version_ |
1799137479094173696 |