PHISICO-CHEMICAL PROPERIES OF ENVIRONMENTAL FRIENDLY STARCH-MMT NANOCOMPOSITES FOR FILM MAKING
|Dipti Rani Mishra1, Nimai Charan Nayak2, Priyanka Mohanty1 and P.L.Nayak1
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The synthesis of starch-clay nanocomposites has been carried out for making biodegradable packaging films and to investigate the effects of chemical compatibility of starch, plasticizer and nanoclay on the composite films. Starch-montmorillonite (MMT) hybrids showed an intercalated nanostructure due to the compatibility of the two components and led to cast film with higher tensile strength and better water vapor barrier properties as compared to starch-organically modified montmorillonite (I30E) hybrids, as well as native starch only. With increase in clay content (0-21 wt%), significantly higher (15-92%) tensile strength (TS) and lower (22-67%) water vapor permeability (WVP) were obtained. The results indicated that nanocomposite technology could be applied to improve the properties of starch-based packaging films. The barrier and mechanical properties of nanocomposite films did not vary significantly with different starch sources (corn, wheat and potato starch), whereas films from regular corn starch showed better properties than either high amylopectin or high amylose-based nanocomposite films.