Abstract
Drawn poly(vinyl trifluoroacetate) (PVTFA) films were converted into syndiotacticity-rich poly(vinyl alcohol) (s-PVA) films through the saponification in solid state with gaseous ammonia. The intensities of crystallization and racemic dial sensitive bands in infrared absorption spectra of the s-PVA films decreased with increasing heat-drawing ratio before Saponification. In the s-PVA film prepared from the PVTFA heat drawn before saponification, the intensity of crystallization sensitive band did not change whereas that of racemic dial sensitive band decreased with heating time respectively. This means that the solid s-PVA prepared from heat-drawn PVTFA has the solid structure determined by that of PVTFA, i. e. the low degree of crystallization and high hydrogen bond content. The s-PVA has hot-water resistance and only soluble at temperatures above 100°C.
