Rheological study of the chitosan/glutaraldehyde chemical gel system

Argüelles Monal, W.; Peniche Covas, C.; Higuera Ciapara, I.

Publication:
Rheological study of the chitosan/glutaraldehyde chemical gel system

dc.contributor.author	Argüelles Monal, W.
dc.contributor.author	Peniche Covas, C.
dc.contributor.author	Higuera Ciapara, I.
dc.contributor.department	Biología Celular e Histología
dc.date.accessioned	2024-02-09T11:55:33Z
dc.date.available	2024-02-09T11:55:33Z
dc.date.created	1998
dc.date.issued	1998
dc.description	©1998. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ This document is the Accepted, version of a Published Work that appeared in final form in Polymer Gels and Networks . To access the final edited and published work see https://doi.org/10.1016/S0966-7822(98)00032-X
dc.description.abstract	Chitosan dissolved in 0.1 mol l~1 acetic acid shows an apparent yield stress at very low frequencies, probably due to a structuring process yielding gel-like response. It re#ects complex relaxation mechanisms once chains disentangle and relax, presumably due to incipient hydrophobic contacts reinforced by the relative sti!ness of the chitosan chains, which tend to slow down reptation. When chemical cross-linkages are introduced, the weak self-associated network of chitosan is gradually replaced by a permanent covalent network as the molar ratio of aldehyde/amine groups, R, is increased. At R"0.4 a glass-to-rubber-type transition is observed, while at R"0.5 the form of the mechanical spectrum suggests the co-existence of a chemically cross-linked gel &dissolved' in a second entangled network formed by chitosan chains of restricted mobility. At higher cross-linking levels (R'1) a strong permanent gel is formed. The observed frequency dependence near the rheological gel point suggests several modes of relaxation processes.
dc.format	application/pdf	es
dc.format.extent	12	es
dc.identifier.citation	Polymer Gels and Networks, 6, 1998: 429-440
dc.identifier.doi	https://doi.org/10.1016/S0966-7822(98)00032-X
dc.identifier.issn	0966-7822
dc.identifier.uri	http://hdl.handle.net/10201/139119
dc.language	eng	es
dc.publisher	Elsevier
dc.relation	financial support from CONACYT, Mexico (Programa de Colaboracion Mexico-Cuba)	es
dc.rights	info:eu-repo/semantics/openAccess	es
dc.rights	Attribution-NoDerivatives 4.0 Internacional	*
dc.rights.uri	http://creativecommons.org/licenses/by-nd/4.0/	*
dc.title	Rheological study of the chitosan/glutaraldehyde chemical gel system	es
dc.type	info:eu-repo/semantics/article	es
dspace.entity.type	Publication	es