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Abstract i) Densities, sorption of water vapor and infrared absorption spectra were measured on four kinds of PVA films, which were prepared from the same PVA powder specimen and subjected to different heattreatments. ii) It was found by the present investigation that the 1146 cm−1 (8.74μ) band is the so-called crystallization-sensitive band. iii) Since the degrees of crystallinity determined by these methods went in parallel, it was found that they may be used as relative measures for the crystallinity. iv) Samples subjected to the heat-treatment at about 193°C, behave abnormally from the other three groups of samples. This deviation was found to be due to chemical changes occurring in the heat-treatment. This was confirmed by the measurement of ultraviolet absorption spectra.
Tadokoro et al. (1955) studied this question.