Journal
CARBOHYDRATE POLYMERS
Volume 90, Issue 4, Pages 1595-1600Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.07.036
Keywords
Polyvinyl alcohol; Starch; Gelatinization; Additive; Morphology; Thermal behavior
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Funding
- National Science & Technology Pillar Program [2007BAE42B04]
- testing center of Southwest University of Science and Technology
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The blend films of ungelatinized and gelatinized starch/polyvinyl alcohol (PVA) were prepared with a solution casting method by the introduction of additives (glycerol/urea) or not. The phase morphologies and thermal behaviors of the blends were carefully analyzed. A droplet phase was observed in the blends containing ungelatinized starch and a laminated phase was observed in the blends containing gelatinized starch. For both ungelatinized and gelatinized starch/PVA blends, the melting temperature (T-m) (210-230 degrees C) of PVA was detected, and the T-m of gelatinized starch/PVA blends was higher than that of the ungelatinized starch/PVA blends. Blend films containing 16.8 wt% of glycerol or urea exhibited a decreased T-m. The introduction of additives (glycerol or urea) reduced the decomposition onset temperature of the blend films. These various morphologies and thermal behaviors could be attributed to the different hydrogen bonding interaction characteristics between starch and polyvinyl alcohol at different conditions. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
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