Properties of extruded xanthan-starch-clay nanocomposite films
Braz. arch. biol. technol
;
54(6): 1223-1333, Nov.-Dec. 2011. ilus, graf, tab
Article
in English
| LILACS
| ID: lil-608445
ABSTRACT
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 percent) 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.
Full text:
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Index:
LILACS (Americas)
Language:
English
Journal:
Braz. arch. biol. technol
Journal subject:
Biology
Year:
2011
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Centro de Ciências Exatas/BR
/
Universidade Estadual de Londrina/BR
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