Exactly alternating silarylene–siloxane polymers. II. The condensation polymerization of arylenedisilanols and bisureidosilanes

A new method for the preparation of exactly alternating silarylene–siloxane polymers by the low temperature step‐growth condensation polymerization reaction of arylenedisilanols and bisurei‐dosilanes in chlorobenzene was investigated. To obtain high molecular weight products 1 H NMR spectroscopy and gel permeation chromatography were used to monitor the polymerization reaction. By using these procedures 12 different polymers were prepared from 1,4‐bis(dimethylhydroxysilyl)‐benzene, 4,4′‐bis(dimethylhydroxysilyl)phenyl ether, bis(1,1‐tetramethylene‐3‐phenylureido)‐dimethylsilane, and bis(1,1‐tetramethylene‐3‐phenylureido)‐methylvinylsilane monomers. The polymers were obtained in high yields, purities, and molecular weights.