US EPA

6764062 

Journal Article 

Anionic ring-opening polymerization of silacyclobutane derivatives 

Matsumoto, K; Shimazu, H; Deguchi, M; Yamaoka, H; , 

1997 

Yes 

Journal of Polymer Science. Part A, Polymer Chemistry
ISSN: 0887-624X
EISSN: 1099-0518 

JOHN WILEY & SONS INC 

NEW YORK 

35 

15 

3207-3216 

English 

10.1002/(SICI)1099-0518(19971115)35:15<3207::AID-POLA13>3.0.CO;2-F 

WOS:A1997YB36500013 

Anionic polymerizations of 1,1-dimethylsilacyclobutane, 1,1-diethylsilacyclobutane and 1-methyl-1-phenylsilacyclobutane were investigated. Addition of 5 mol % of butyllithium to a solution of 1,1-dimethylsilacyclobutane in THF-hexane (1 : 1) at -48 degrees C provided poly(1,1-dimethylsilabutane) in 99% yield. M-n and M-w/M-n of the obtained polymer were 2400 and 1.10. This polymerization proceeded with a living nature. M-n increased in proportion as the yield of polymer increased. Addition of the second fresh feed of the monomer to the reaction mixture restarted polymerization of the second monomer at the same rate as in the initial stage. Addition of styrene to the living poly(1,1-dimethylsilabutane) provided a poly(1,1-dimethylsilabutane-b-styrene) block copolymer. It was also found that a polymerization of 1,1-diethylsilacyclobutane in THF-hexane at -48 degrees C showed a living nature. In contrast, a polymerization of 1-methyl-1-phenylsilacyclobutane in THF at -78 degrees C did not show a living nature. (C) 1997 John Wiley & Sons, Inc. 

Block copolymer; Living polymerization; Poly(1,1-diethylsilabutane); Poly(1,1-dimethylsilabutane); Poly(1-methyl-1-phenylsilabutane); Silacyclobutane