Journal
CARBOHYDRATE POLYMERS
Volume 113, Issue -, Pages 569-576Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.07.054
Keywords
TPS/montmorillonite nanocomposite; Mechanical properties; Wet conditioning; Interfacial interactions
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Funding
- National Scientific Research Fund of Hungary (OTKA) [K 67936, K 108934]
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TPS/Na-montmorillonite nanocomposite films were prepared by solution and melt blending. Clay content changed between 0 and 25 wt% based on the amount of dry starch. Structure, tensile properties, and water content of wet conditioned films were determined as a function of clay content. Intercalated structure and V-H-type crystallinity of starch were found for all the nanocomposites independently of clay and plasticizer content or preparation method, but at larger than 10 wt% clay content nanocomposites prepared by melt intercalation contained aggregated particles as well. In spite of the incomplete exfoliation clay reinforces TPS considerably. Preparation method has a strong influence on mechanical properties of wet conditioned films. Mechanical properties of the conditioned samples prepared by solution homogenization are much better than those of nanocomposites prepared by melt blending. Water, which was either adsorbed or bonded in the composites in conditioning or solution mixing process, respectively, has different effect on mechanical properties. (C) 2014 Elsevier Ltd. All rights reserved.
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