QUARTERLY PROGRESS REPORT #8 May 1, 1363 – July 31, 1963 Synthesis of Regulated Structure Polyphenylether-Siloxane Block Copolymers

摘要

Copolymers of 4,4 dihydroxydiphenylether with dipbeayldlchlcrosilane of comparatively high molecular weight have been prepared. Some, which were previously reported to be prematurely crosslinked have been found to be soluble in dimethylformamide, and polymerization in this solvent has resulted in completely soluble polymer. This result, with analytical measurements, indicates adequate monomer purity.nThe preparation of dihydroxypolyphenylethers has been attempted by means of the Ullmann condensation reaction between dibromo-and dihydroxyaromatic compounds. Preliminary results indicate that the desired monomers were formed. A condensation by dehydration of hydroquinone resulted in the formation of 4.4dihydroxydiphenylether, but no polyphenylether derivatives have been detected in the products of this re¬action.