Morphological investigation of nanocomposites from sorbitol plasticized starch and tunicin whiskers.
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.
Mathew
Aji P
AP
Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), Université Joseph Fourier, BP 53, F 38041 Grenoble Cedex 9, France.
Dufresne
Alain
A
D000042:Absorption; D002482:Cellulose / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003460:Crystallization; D004058:Diffusion; D006813:Humidity; D008422:Materials Testing; D036103:Nanotechnology; D010968:Plasticizers / Q000737:chemistry*; D013012:Sorbitol / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
D003188:Composite Resins; D010968:Plasticizers; D013012:Sorbitol; D002482:Cellulose; D013213:Starch