Crystalline structure of poly(diaryl siloxanes)

Abstract

Transmission electron microscopy and X-ray diffraction were used to resolve the crystalline structure of linear poly(diphenyl siloxane) and also two polymers that contain p-tolyl substituents at the silicon atom along with phenyl substituents. It has been shown that an increase in the number of p-tolyl groups per macromolecule leads to an increase in the cross-sectional area of the unit cell per chain. The softening temperature is thereby lowered, and polymer solubility improved.