High-molecular crystalline polymer with alternating dimethylene and methyl-substituted disilene units in the main chain and method for preparing same

摘要

PCT No. PCT/SU79/00038 Sec. 371 Date Apr. 30, 1980 Sec. 102(e) Date Apr. 30, 1980 PCT Filed Jun. 15, 1979 PCT Pub. No. WO80/00446 PCT Pub. Date Mar. 20, 1980. A novel chemical compound-a high-molecular crystalline polymer with alternating dimethylene and methyl-substituted disilene units in the main chain of the formula: <IMAGE> wherein n is an integer of from 800 to 1,000. A method for preparing this polymer consists in that vapors of 1,2-bis(dimethylchlorosilyl)ethane is subjected to interaction with vapors of metallic sodium and/or potassium at a temperature within the range of from 250 DEG to 380 DEG C. under a pressure of 1,2-bis(dimethylchlorosilyl)ethane of from 0.1 to 10 mm Hg, followed by condensation of vapors of the resulting 1,1,2,2-tetramethyl-1,2-disilacyclobutane and polymerization thereof at a temperature within the range of from 20 DEG to 100 DEG C. One of embodiments of the method for preparing this polymer comprises polymerization in bulk of 1,1,2,2-tetramethyl-1,2-disilacyclobutane at a temperature within the range of from 20 DEG to 25 DEG C.