Anionic ring-opening polymerization of phenylsilacyclobutanes

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 (_M__n_) and monomer conversion were observed. The molecular weight of the obtained polymer was very narrow

(_M__w_/_M__n_ = 1.09, _M__w_ 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 (_T_g)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). SIMILAR

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INFORMATION AUTHORS AND AFFILIATIONS * Department of Polymer Chemistry, Kyoto University, Kyoto, 606-8501, Japan Kozo Matsumoto, Masaaki Shinohata & Hitoshi Yamaoka Authors * Kozo

Matsumoto View author publications You can also search for this author inPubMed Google Scholar * Masaaki Shinohata View author publications You can also search for this author inPubMed 

Google Scholar * Hitoshi Yamaoka View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE

THIS ARTICLE Matsumoto, K., Shinohata, M. & Yamaoka, H. Anionic Ring-Opening Polymerization of Phenylsilacyclobutanes. _Polym J_ 32, 354–360 (2000). https://doi.org/10.1295/polymj.32.354

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Silacyclobutane * Phenylsilacyclobutane * Living Anionic Polymerization * Ring-Opening Polymerization * Polysilacyclobutane