Swelling of Polyvinyl Alcohol Films Treated with Periodate Solution

II. Influence of the Film-forming Conditions and Polymerization Type on the Swelling

Abstract

The films of PVA prepared under the various polymerization conditions were formed at room temperature (about 20°C) and 50°C, and heat-treated at 150°C for 30 minutes, then swelled in water at 30°C after treating in the aqueous periodate solution. The results obtained are as follows: 1) Since the degrees of swelling vary with the film-forming conditions, it seems that the differences in fine texture exist. 2) In the heat-treated films, the degree of swelling of PVA prepared by methanol solution polymerization is smaller than that of PVA obtained from bulk polymerization. 3) When a large amount of benzoyl peroxide is used as the initiator of polymerization, the degree of swelling of PVA obtained is greater than that of PVA polymerized with AZN.