Morphological investigation of nanocomposites from sorbitol plasticized starch and tunicin whiskers

被引:290
作者
Mathew, AP [1 ]
Dufresne, A [1 ]
机构
[1] Univ Grenoble 1, Ctr Rech Macromol Vegetales, CNRS, CERMAV, F-38041 Grenoble 9, France
关键词
D O I
10.1021/bm0101769
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Nanocomposites were prepared from waxy maize starch Plasticized with sorbitol as the matrix and a stable aqueous suspension of tunicin whiskers-an animal cellulose-as the reinforcing phase. The composites were conditioned at different relative humidity levels. The conditioned films were characterized using scanning electron microscopy, differential scanning calorimetry, water uptake experiments, and wide-angle X-ray scattering studies. Contrarily to our previous report concerning tunicin whisker filled glycerol plasticized starch nanocomposites (Macromolecules 2000, 33, 8344), the present system exhibited a single glass-rubber transition, and no evidence of transcrystallization of amylopectin on cellulose whisker surfaces and resultant antiplasticizing effects were observed. It was found that the glass-rubber transition temperature of the plasticized amylopectin matrix first increases up a whiskers content around 10-15 wt % and then decreases. A significant increase in crystallinity was observed in the composites by increasing either moisture content or whiskers content.
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页码:609 / 617
页数:9
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