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The influence of layered compounds on the properties of starch/layered compound composites

✍ Scribed by Helena-M Wilhelm; Maria-R Sierakowski; Gabriel P Souza; Fernando Wypych

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
340 KB
Volume
52
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

Glycerol‐plasticized starch films were modified by addition of various layered compounds as fillers, two being of natural origin (kaolinite, a neutral mineral clay, and hectorite, a cationic exchanger mineral clay) and two synthetic (layered double hydroxide, LDH, an anionic exchanger, and brucite, having a neutral structure). The effects of the filler type and the plasticizer were analyzed by X‐ray diffraction, dynamic mechanical analysis and thermogravimetry. The storage modulus was higher for kaolinite > brucite > hectorite than for LDH starch composites. However, only the hectorite filler presented a shift of the interplanar basal distance to higher values, which represents the intercalation of glycerol molecules between the clay layers. The glycerol intercalation is minimized in plasticized–oxidized starch films where the oxidized starch chains are preferentially intercalated. Copyright © 2003 Society of Chemical Industry

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