Lei Zheng, Rajeswari M. Kasi, Richard J. Farris and E. Bryan Coughlin
Copolymerizations of styrene and the polyhedral oligomeric silsesquioxane (POSS)–styryl macromonomer 1-(4-vinylphenyl)-3,5,7,9,11,13,15-heptacyclopentylpentacyclo [22.214.171.124,9.15,15.17,13] octasiloxane (1) have been performed with CpTiCl3 in conjunction with methylaluminoxane. Random copolymers of syndiotactic polystyrene (sPS) and POSS copolymers have been formed and fully characterized. NMR reveals a moderately high syndiotacticity of the polystyrene backbone consistent with this CpTiCl3 catalyst and POSS loadings as high as 24 wt % and 3.2 mol %. Thermogravimetric analysis of the sPS–POSS copolymers under both nitrogen and air shows improved thermal stability with higher degradation temperatures and char yields.