Preceramic polysiloxane networks obtained by hydrosilylation of 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane.

摘要: Abstract Precreamic polysiloxane networks were prepared by hydrosilylation of 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane (D 4 Vi ) with a series linear hydrogensiloxanes as well cyclic hydrogensiloxane, namely 2,4,6,8-tetramethylcyclotetrasiloxane H at various hydrogensiloxane/D molar ratios in the starting reaction mixture. FTIR spectroscopic measurements conducted during processes for products allowed to reveal that rate D its efficiency are influenced type hydrogensiloxane used and reactants ratio. Ceramic yields determined 1000 °C thermogravimetric analyses higher –D than – (86–89% vs 65–76%, respectively). Preceramic polysiloxanes their pyrolysis obtained after thermal investigations monolithic, pore-less materials.