Abstract
Synthesis and anionic polymerization of 1, 1-dimethyl-3-(1-naphthylmethyl) silacyclobutane (3-NMSB), 3-(4-biphenylmethyl)-1, 1-dimethylsilacyclobutane (3-BMSB), and 1, 1-dimethyl-3-(1-naphthyl) silacyclobutane (3-NSB) were investigated. 3-NMSB, 3-BMSB, and 3-NSB were synthesized by hydrosilation of 3-chloro-2-(1-naphthylmethyl)-1-propene, 3-chloro-2-(4-biphenylmethyl)-1-propene, or 3-chloro-2-(1-naphthyl)-1-propene with chlorodimethylsilane followed by a treatment with megnesium, respectively. Butyllithium-induced polymerization of 3-NMSB, 3-BMSB, and 3-NSB under a condition of [M]0/[I]0=20/1 ([M]0 and [I]0 are the initial concentrations of monomer and initiator) in THF at −78°C was carried out. Poly(3-NMSB) (Mn=3500, Mw/Mn=1.21), poly(3-BMSB) (Mn=4600, Mw/Mn=1.09, and poly(3-NSB) (Mn=3200, Mw/Mn=1.16, where Mn and Mw were estimated by GPC using polystyrene as standards) were obtained. By differential scanning calorimetry (DSC) measurements, glass transition temperatures (Tg)s were determined at 17°C for poly(3-NMSB), 28°C for poly(3-BMSB), and 39°C for poly(3-NSB).
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Matsumoto, K., Shinohata, M. & Yamaoka, H. Synthesis and Anionic Polymerization of Silacyclobutanes Bearing Naphthyl or Biphenyl Groups at the 3-Position. Polym J 32, 1022–1029 (2000). https://doi.org/10.1295/polymj.32.1022
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DOI: https://doi.org/10.1295/polymj.32.1022