Abstract
Films prepared from polyvinylketal obtained by acetone, with different ketalization degree, were soaked in water and degree of swell, solubility, and hydrolysis of films were measured. The reaction of film with water, in acidic side, easily proceeds even at lower temperature ranges, and at first film swells, and then as deketalization reaction proceeds the film dissolves in water. Polyvinylketal of the ketalization degree below 5 mol% behaves similarly to polyvinylalcohol (PVA). With polyvinylketal of the ketalization degree of above 5 mol%, dissolution time is controlled by both ketalization degree and pH of water which reveals that deketalization reaction proceeds proportional to proton concentration. On the other hand, in neutral or alkaline conditions where hydrolysis does not proceed at all, polyvinylketal of ketalization degree of 15–60 mol% dissolves in water at 0°C and therefore it can be considered as a kind of water-soluble high polymer. Polyvinylketal dissolves more easily in water at lower temperatures than at higher temperatures.
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