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Home  >  Journal list  >  Polymer Journal  >  Vol.32  No.4 (2000)  >  pp.354-360

Polymer Journal
<<Previous article Vol.32  No.4 (2000)   pp.354 - 360 Next article>>

Anionic Ring-Opening Polymerization of Phenylsilacyclobutanes

Kozo MATSUMOTO1), Masaaki SHINOHATA1) and Hitoshi YAMAOKA1)
1) Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan

ABSTRACT:  Butyllithium-induced anionic ring-opening polymerization of phenyl-substituted silacyclobutanes was investigated. Polymerization of 1, 1-dimethyl-3-phenylsilacyclobutane in tetrahydrofuran (THF) at -78°C proceeded in a living fashion. A linear relationship between ln[M]0/[M] and time ([M]0 is the initial concentration of the monomer and [M] is the concentration of monomer) and a linear relationship between number-average molecular weight (Mn) and monomer conversion were observed. The molecular weight of the obtained polymer was very narrow (Mw/Mn = 1.09, Mw is weight-average molecular weight). In contrast, neither 1, 1-dimethyl-2-phenylsilacyclobutane nor 1-methyl-1-phenylsilacyclobutane showed a living nature under the same polymerization conditions, which were confirmed by two-step monomer addition experiments. 13C NMR and 29Si NMR spectrum of the poly(1, 1-dimethyl-2-phenylsilacyclobutane) indicated that polymerization of 1, 1-dimethyl-2-phenylsilacyclobutane proceeded without regioselectivity. By differential scanning calorimetry (DSC) measurements, glass transition temperatures (Tg)s were determined at -5°C for poly(1, 1-dimethyl-3-phenylsilacyclobutane), 27°C for poly(1, 1-dimethyl-2-phenylsilacyclobutane), and -29°C for poly(1-methyl-1-phenylsilacyclobutane).


Keyword:
Silacyclobutane/ Phenylsilacyclobutane/ Living Anionic Polymerization/ Ring-Opening Polymerization/ Polysilacyclobutane

Published online: June 29, 2001
© Copyright, 2000 by The Society of Polymer Science, Japan

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