Synthesis, characterization, and thermal properties of poly(methylvinylsilylene-co-styrene)

The copolymerization of methylvinyldichlorosilane (MVDCS) and styrene was carried out with various monomer feed ratios under dechlorination conditions with sodium in toluene at 110degreesC. The copolymers were obtained in 84-95% yields. The copolymerization of MVDCS and styrene with monomer feed ratios of 1 : 0.25 and I : 0.5 mainly gave insoluble polymers. The copolymers synthesized with monomer feed ratios of 1 : 1, 1 : 3, and 1 : 7 contained soluble fractions of 3, 26, and 47%, respectively. The copolymers were characterized with infrared, H-1-NMR, gel permeation chromatography, thermogravimetric analysis, pyrolysis/gas chromatography (PGC), X-ray diffraction, and elemental analysis (silicon content). 1H-NMR and PGC studies suggested that the soluble fractions were mainly polystyrene. PGC studies indicated that the copolymers obtained with monomer feed ratios of 1 : 0.25 and I : 0.5 did not have any significant amount of polystyryl blocks, whereas the copolymers obtained with higher styrene feed ratios contained appreciable amounts of polystyryl. blocks. The composition of the insoluble fractions of the copolymers was obtained from PGC data and was in good agreement with the composition calculated from the silicon content of the copolymers. (C) 2004 Wiley Periodicals, Inc.