Properties of extruded xanthan-starch-clay nanocomposite films

AUTOR(ES)

Melo, Cristina de, Garcia, Patrícia Salomão, Grossmann, Maria Victória Eiras, Yamashita, Fábio, Dall'Antônia, Luiz Henrique, Mali, Suzana

FONTE

Brazilian Archives of Biology and Technology

DATA DE PUBLICAÇÃO

2011-12

RESUMO

The aim of this work was to manufacture the biodegradable nanocomposite films by extrusion from different combinations of cassava starch, xanthan gum and nanoclays (sodium montmorillonite - MMT- Na) and to characterize them according to their microstructure, optical, mechanical and barrier properties. Films were manufactured from nine starch/xanthan/nanoclay combinations, containing glycerol as plasticizer. Scanning electron microscopy (SEM) of the starch-xanthan extruded films showed reticulated surface and smooth interior, indicating that the gum was mostly concentrated on the surface of the films, while starch/xanthan/nanoclays films showed a more homogeneous surface, suggesting that the introduction of nanoclays provided a better biopolymeric interaction. In general, nanoclays addition (2.5 - 5.0, w%) generated more transparent and resistant films, with lower water vapor permeabilities and lower water sorption capacities and xanthan gum addition improved the elongation ofa starch films.

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