Orientation studies of poly(vinyl chloride). Part I: Intrinsic birefringence

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Abstract
The intrinsic birefringence of rigid poly(vinyl chloride), PVC, was obtained from measurement of birefringence and infrared dichroism. Rigid PVC samples were stretched at temperatures above the glass‐transition temperature, Tg, to various stretch ratios. The measured intrinsic birefringence obtained in this study is consistent with theoretically calculated and previously measured values using other techniques and samples. From the intrinsic birefringence, the principal polarizability differences of the PVC monomer were also calculated, and the results are comparable with those estimated from flow birefringence measurements of PVC dilute solutions.