Multiple steam sterilization drastically affects the micromorphology of poly(vinyl chloride) (PVC). Stereoregularity as well as chain branching of sterilized PVC samples varies in covered and uncovered samples. Attenuated total reflectance (ATR) spectral studies confirm these variations which are exhibited by the peaks at 1428 cm−1 and 1434 cm−1 for stereoregularity and by the peak at 1378 cm−1 for chain branching. Differential scanning calorimetry (DSC) studies of sterilized samples indicate that the changes in the glass transition temperature (Tg) are not linear with the changes in syndiotacticity. Variation in the length of chain branches have a predominant effect over the variations in syndiotacticity: short chain branches and long chain branches offer higher and lower Tg, respectively, though the degree of syndiotacticity is the same in both cases.
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Jayabalan et al. (1986) studied this question.
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