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The atactic poly(vinyl alcohol) (a-PVA) aqueous solutions with Na2SO4 or CH3COONa were cast to prepare films and then the Na2SO4 or CH3COONa in the films was removed. Both films prepared by removing Na2SO4 or CH3COONa in water had a water-resistance property. The degree of crystallization of the films increased with an increase of the contents of Na2SO4 and CH3COONa in the solutions up to 0.05 and...
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