A novel and facile method for direct synthesis of cross-linked polysiloxanes by anionic ring-opening copolymerization with Ph12-POSS/D4/Ph8D4

The cross-linked polysiloxanes were directly synthesized by anionic ring-opening copolymerization of Ph12-POSS as multifunctional monomer with D4 and Ph8D4 under KOH or Me4NOH siloxanolate. And the influences of the polar additive DMAc on gelation time were investigated. The results of gel content and swelling ratio, GPC, solid-state 29Si and 13C NMR, FT-IR, WAXD showed that Ph12-POSS was reacted and most of the product was cross-linked. The DSC and TG results indicated that the cross-linked polysiloxanes exhibited distinct glass transition temperatures (Tg) and excellent thermal stability. Compared to that with KOH siloxanolate, the cross-linked polysiloxane synthesized with Me4NOH siloxanolate has more preferable thermal stability.