Studies on the configuration and conformation of vinyl‐type polymers. II. Temperature dependence of the infrared spectrum of polyvinyl chloride in solution and stereoregularity

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Abstract
The temperature dependence of the infrared spectra of polyvinyl chlorides in concentrated cyclohexanone solution has been studied. It is found that the absorbance ratio of the band at 696 cm.−1 to the band at 616 cm.−1, D696/D616, decreased as the measuring temperature was raised. This experimental finding has been interpreted as due to the reversible conformational change of the chain in the syndiotactic sequences of PVC. The syndiotacticity α of PVC was estimated to be in the range of 0.86 to 0.52 with varying of the polymerization temperature from −60°C. to 50°C. The stable conformations of the polymer chain in solution were also discussed.