Surface properties of xylan and xylan derivatives measured by inverse gas chromatography

Detalhes bibliográficos
Autor(a) principal: Sousa, Sónia
Data de Publicação: 2016
Outros Autores: Pedrosa, Jorge, Ramos, Ana, Ferreira, Paulo J., Gamelas, José A. F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/33050
https://doi.org/10.1016/j.colsurfa.2016.07.006
Resumo: Xylan (the most common hemicellulose in wood and annual plants) and xylan derivatives have a very wide field of uses for which physico-chemical surface properties play an important role (e.g. in composites or barrier materials). In the present work, for the first time, inverse gas chromatography (at infinite dilution conditions) was used to assess the surface properties of xylan and xylan derivatives. Firstly, carboxymethyl xylan (CMX) and hydroxypropyl xylan (HPX) have been synthesized from commercial xylan (BX) and the presence of substituent groups confirmed by infrared spectroscopy and 1H NMR. Then, the modified and original xylans were analysed for their dispersive component of the surface energy (γsd) and Lewis acid-base properties. It was found that carboxymethylation and hydroxypropylation decreased significantly the γsd value of xylan: from 47.6 mJ m⿿2 in BX to 33.0 mJ m⿿2 and 23.5 mJ m⿿2 in CMX and HPX, respectively. As for the Lewis acid-base properties, HPX showed a perfectly amphoteric behaviour while the surfaces of unmodified xylan and CMX showed a prevalence of Lewis acidic character over the Lewis basic character, being, however, the surface of CMX less acidic than that of the original xylan. These results were interpreted in terms of the effect of the presence of the new substituent groups in the xylan backbone.
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spelling Surface properties of xylan and xylan derivatives measured by inverse gas chromatographyInverse gas chromatographyWood xylanXylan derivativesSurface energyLewis acid-base characterXylan (the most common hemicellulose in wood and annual plants) and xylan derivatives have a very wide field of uses for which physico-chemical surface properties play an important role (e.g. in composites or barrier materials). In the present work, for the first time, inverse gas chromatography (at infinite dilution conditions) was used to assess the surface properties of xylan and xylan derivatives. Firstly, carboxymethyl xylan (CMX) and hydroxypropyl xylan (HPX) have been synthesized from commercial xylan (BX) and the presence of substituent groups confirmed by infrared spectroscopy and 1H NMR. Then, the modified and original xylans were analysed for their dispersive component of the surface energy (γsd) and Lewis acid-base properties. It was found that carboxymethylation and hydroxypropylation decreased significantly the γsd value of xylan: from 47.6 mJ m⿿2 in BX to 33.0 mJ m⿿2 and 23.5 mJ m⿿2 in CMX and HPX, respectively. As for the Lewis acid-base properties, HPX showed a perfectly amphoteric behaviour while the surfaces of unmodified xylan and CMX showed a prevalence of Lewis acidic character over the Lewis basic character, being, however, the surface of CMX less acidic than that of the original xylan. These results were interpreted in terms of the effect of the presence of the new substituent groups in the xylan backbone.Elsevier2016info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/33050http://hdl.handle.net/10316/33050https://doi.org/10.1016/j.colsurfa.2016.07.006https://doi.org/10.1016/j.colsurfa.2016.07.006eng0927-7757http://www.sciencedirect.com/science/article/pii/S0927775716305192Sousa, SóniaPedrosa, JorgeRamos, AnaFerreira, Paulo J.Gamelas, José A. F.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:RCAAP2021-08-31T08:29:03Zoai:estudogeral.uc.pt:10316/33050Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:59:12.914305Repositório 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 properties of xylan and xylan derivatives measured by inverse gas chromatography
title Surface properties of xylan and xylan derivatives measured by inverse gas chromatography
spellingShingle Surface properties of xylan and xylan derivatives measured by inverse gas chromatography
Sousa, Sónia
Inverse gas chromatography
Wood xylan
Xylan derivatives
Surface energy
Lewis acid-base character
title_short Surface properties of xylan and xylan derivatives measured by inverse gas chromatography
title_full Surface properties of xylan and xylan derivatives measured by inverse gas chromatography
title_fullStr Surface properties of xylan and xylan derivatives measured by inverse gas chromatography
title_full_unstemmed Surface properties of xylan and xylan derivatives measured by inverse gas chromatography
title_sort Surface properties of xylan and xylan derivatives measured by inverse gas chromatography
author Sousa, Sónia
author_facet Sousa, Sónia
Pedrosa, Jorge
Ramos, Ana
Ferreira, Paulo J.
Gamelas, José A. F.
author_role author
author2 Pedrosa, Jorge
Ramos, Ana
Ferreira, Paulo J.
Gamelas, José A. F.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Sousa, Sónia
Pedrosa, Jorge
Ramos, Ana
Ferreira, Paulo J.
Gamelas, José A. F.
dc.subject.por.fl_str_mv Inverse gas chromatography
Wood xylan
Xylan derivatives
Surface energy
Lewis acid-base character
topic Inverse gas chromatography
Wood xylan
Xylan derivatives
Surface energy
Lewis acid-base character
description Xylan (the most common hemicellulose in wood and annual plants) and xylan derivatives have a very wide field of uses for which physico-chemical surface properties play an important role (e.g. in composites or barrier materials). In the present work, for the first time, inverse gas chromatography (at infinite dilution conditions) was used to assess the surface properties of xylan and xylan derivatives. Firstly, carboxymethyl xylan (CMX) and hydroxypropyl xylan (HPX) have been synthesized from commercial xylan (BX) and the presence of substituent groups confirmed by infrared spectroscopy and 1H NMR. Then, the modified and original xylans were analysed for their dispersive component of the surface energy (γsd) and Lewis acid-base properties. It was found that carboxymethylation and hydroxypropylation decreased significantly the γsd value of xylan: from 47.6 mJ m⿿2 in BX to 33.0 mJ m⿿2 and 23.5 mJ m⿿2 in CMX and HPX, respectively. As for the Lewis acid-base properties, HPX showed a perfectly amphoteric behaviour while the surfaces of unmodified xylan and CMX showed a prevalence of Lewis acidic character over the Lewis basic character, being, however, the surface of CMX less acidic than that of the original xylan. These results were interpreted in terms of the effect of the presence of the new substituent groups in the xylan backbone.
publishDate 2016
dc.date.none.fl_str_mv 2016
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/10316/33050
http://hdl.handle.net/10316/33050
https://doi.org/10.1016/j.colsurfa.2016.07.006
https://doi.org/10.1016/j.colsurfa.2016.07.006
url http://hdl.handle.net/10316/33050
https://doi.org/10.1016/j.colsurfa.2016.07.006
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0927-7757
http://www.sciencedirect.com/science/article/pii/S0927775716305192
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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)
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