Poly(l-methyl-l-vinyl-l-silabutane),poly(l-phenyl-l-vinyl-l-silabutane), andpoly(l, 1-divinyl-1-silabutane) have been prepared by anonic ring-opening polymerization, cocatalyzed by n-butyllithium and hexamethylphosphoramide (HMPA) in THF at -78 °C, of i-methyl-l-vinyl-l-silacyclobutane, 1-phenyl-lvinyl-l-silacyclobutane, and 1,1-divinyl-l-silacyclobutane, respectively. These polymers have been characterized by 1H, 13C, and 29Si NMR as well as FT-IR and UV spectroscopy. Their molecular weight distribution has been determined by gel permeation chromatography (GPC), their thermal stability by thermogravimetric analysis (TGA), and their glass transition temperatures (Tg) by differential scanning calorimetry (DSC). Thermal degradation of poly(l,l-divinyl-l-silabutane) in an inert atmosphere gives a 45% char yield.
3'-(phenyloxy)propyl]-i-silabutane], and poly [l-methyl-l-[3'-(pentafluorophenyl)propyl]-l-ailabutane] have been prepared by the platinum-catalyzed hydrosilation graft reactions between poly(l-methyl-l-silabutane) and the appropriate functional alkene. These polymers have been characterized by , 13C, 19F (where appropriate), and "Si NMR as well as by FT-IR and UV spectroscopy. The molecular weight distributions
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