Copolymerization of 1,1-Dimethyl-1-Silacyclopent-3-ene and 1,1-Diphenyl-1-Silacyclopent-3-ene. Characterization of Copolymer Microstructures by H1, C13, and Si29 NMR Spectroscopy

摘要

1,1-Dimethyl-1-silacyclopent-3-ene and 1,1-diphenyl-1-silacyclopent-3-ene havebeen copolymerized by treatment with n-butyllithium and hexamethylphosphoramide in tetrahydrofuran at -50 C. Random copolymers are formed. The microstructures of these have been characterized by (1)H, (13)C and (29)Si NMR spectroscopy. Thermal stabilities of these copolymers have been determined by thermogravimetric analysis. Their glass transition temperatures have been measured by differential scanning calorimetry. (jg)