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

被引:87
作者
Almeida, E. V. R. [1 ,2 ]
Frollini, E. [2 ]
Castellan, A. [1 ]
Coma, V. [1 ]
机构
[1] Univ Bordeaux 1, US2B, CNRS, INRA,UMR 5103, F-33405 Talence, France
[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
关键词
Chitosan-cellulose films; Biocomposite; NaOH/thiourea aqueous solutions; PHYSICOCHEMICAL PROPERTIES; THERMAL-DEGRADATION; BLEND FILM; DISSOLUTION; MISCIBILITY; PYROLYSIS; HYDROGELS; STRENGTH; GELATION; FIBERS;
D O I
10.1016/j.carbpol.2009.10.039
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
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.
引用
收藏
页码:655 / 664
页数:10
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