PVA is a biodegradable synthetic polymer, which has excellent strength and flexibility. It has been reported that addition of PVA improves the strength and flexibility of gelatinized starch (Shogren et al., 1998). young (1967) found that films cast from aqueous solutions of amylose or high amylose starch and PVA had higher strength and elongation at break at 23 and 50% humidity than films cast from starch alone.
Otey and Mark (1976) found similar improvement in mechanical properties for films cast from solution mixtures of normal cornstarch and PVA. Shogren et al. (1998b) prepared starch-PVA foam articles by a backing process and found that foam strength, flexibility, and water resistance were markedly improved by addition of 10-30% poly(vinyl alcohol) to starch batters.
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