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Physico-Mechanical Properties of Biodegradable Starch Nanocomposites

✍ Scribed by Nancy L. García; Laura Ribba; Alain Dufresne; Mirta I. Aranguren; Silvia Goyanes

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
454 KB
Volume
294
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

Nanocomposites of cassava starch reinforced with waxy starch nanocrystals were prepared. They showed a 380% increase of the rubbery storage modulus (at 50 °C) and a 40% decrease in the water vapor permeability. X‐ray spectra show that the composite was more amorphous than the neat matrix, which was attributed to higher equilibrium water content in the composites. TGA confirmed this result and its thermal derivative suggested the formation of hydrogen bonding between glycerol and the nanocrystals. The reinforcing effect of starch nanocrystals was attributed to strong filler/matrix interactions due to the hydrogen bonding. The decrease of the permeability suggests that the nanocrystals were well dispersed, with few filler/filler interactions.

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