Chitosan, sisal cellulose, and biocomposite chitosan/sisal cellulose films prepared from thiourea/NaOH aqueous solution


Autoria(s): ALMEIDA, E. V. R.; FROLLINI, E.; CASTELLAN, A.; COMA, V.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2010

Resumo

Environmentally friendly biocomposites were successfully prepared by dissolving chitosan and cellulose in a NaOH/thiourea solvent with subsequent heating and film casting. Under the considered conditions, NaOH/thiourea led to chain depolymerization of both biopolymers without a dramatic loss of film forming capacities. Compatibility of both biopolymers in the biocomposite was firstly assessed through scanning electron microscopy, revealing an intermediate organization between cellulose fiber network and smoothness of pure chitosan. DSC analyses led to exothermic peaks close to 285 and 315 degrees C for the biocomposite, compared to the exothermic peaks of chitosan (275 degrees C) and cellulose (265 and 305 degrees C), suggesting interactions between chitosan and cellulose. Contact angle analyses pointed out the deformation that can occur at the surface due to the high affinity of the;e materials with water. T(2) NMR relaxometry behavior of biocomposites appeared to be dominated by chitosan. Other properties of films, as crystallinity, water sorption isotherms, among others, are also discussed. (C) 2010 Published by Elsevier Ltd.

Identificador

CARBOHYDRATE POLYMERS, v.80, n.3, p.655-664, 2010

0144-8617

http://producao.usp.br/handle/BDPI/31677

10.1016/j.carbpol.2009.10.039

http://dx.doi.org/10.1016/j.carbpol.2009.10.039

Idioma(s)

eng

Publicador

ELSEVIER SCI LTD

Relação

Carbohydrate Polymers

Direitos

restrictedAccess

Copyright ELSEVIER SCI LTD

Palavras-Chave #Chitosan-cellulose films #Biocomposite #NaOH/thiourea aqueous solutions #BLEND FILMS #PHYSICOCHEMICAL PROPERTIES #THERMAL-DEGRADATION #IONIC LIQUIDS #DISSOLUTION #FIBERS #MISCIBILITY #PYROLYSIS #HYDROGELS #STRENGTH #Chemistry, Applied #Chemistry, Organic #Polymer Science
Tipo

article

original article

publishedVersion