Journal
CARBOHYDRATE POLYMERS
Volume 84, Issue 1, Pages 145-152Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2010.11.018
Keywords
Polyvinyl alcohol; Dextran; Freeze-thaw; Xerogels; Thermal properties
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Physically crosslinked hydrogels composed of different amounts of dextran in PVA matrix were prepared by applying freeze-thaw cycles to their aqueous solutions. Morphology, thermal properties and FTIR spectra of the resulting blend xerogels were examined by SEM, DSC, TGA and FTIR spectroscopy. Blend xerogels containing 10% (w/w) dextran showed more compatibility/miscibility according to SEM and DSC results. The T-g of the xerogels did not show any significant changes with increased dextran content. Introducing dextran into the freeze-thawed PVA structure affected crystal size distribution of PVA; and hence thermal degradation behavior of the xerogels. An increase in dextran content resulted in broader crystal size distribution; better and still lower thermal stability in comparison to virgin PVA and freeze-thawed PVA, respectively. (C) 2010 Elsevier Ltd. All rights reserved.
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