X-Ray Investigations of Polyvinyl Chloride

I. On the New Reflections Found in the Fiber Diagram

Abstract

Uniaxially-oriented specimens of polyvinyl chloride (PVC) show generally two new reflections, M₁ (d=5.15Å) and L₁ (d=4.69Å) on the meridian of the X-ray diagram. In order to decide a correct interpretation with regard to these reflections, we examined systematically many uniaxially-oriented specimens of PVC which had been prepared at the temperature range between 50°C and -78°C. The M₁ reflection can be explained as the meridian reflection which comes from the net planes perpendicular to the fiber axes in crystalline regions, and the L₁ reflection can be interpreted as the layer reflection. It seems that the intensity and the sharpness of these reflections increases according as the polymerization temperature decreases.