| Hydroxy-terminated ladder-like polysiloxane was synthesized from ethylene diamine and monomethyltrichlorosilane by stepwise coupling polymerization. Meanwhile, hydroxy-terminated single-chain polysiloxane with different viscosity was also synthesized from octamethylcyclotetrasiloxane by alkali-catalyzed method.After that, some following experiments were completed :1. Hydroxy-terminated single-chain polysiloxane and active chlorine- contained end-capping reagent were used to synthesis polysiloxane which can be solidified under ultraviolet. The characteristic functional groups of end-capping reagent were proved by FTIR. Meanwhile, ultraviolet curing experiment was done when a certain photoinitiator was in existence, and the result showed that ethenyl-terminal polysiloxane could be solidified under ultraviolet.2. High quality polymer damping material was synthesized by interpenetrating networks polymerization using polysiloxane and acrylate.Some affected factors to damping property were studied, such as the compounding ratio of component, the quantity of crosslinking agent, and the ratio of single-chain to ladder-like polysiloxane. And the morphology of damping material was also observed by AFM. The damping property was measured by MTS and the result showed that when the optimal ratio of poly (n-butyl methacrylate) to polysiloxane was 80:20, the damping factor tg δmax was 0.9. And then changing the quantity of crosslinking agent, the result showed that the damping factor tg δmax was up to 1.4 when the ratio of crosslinking agent was 8%. Under the optimal ratio and quanlity of crosslinking agent, damping material was synthesized using different viscosity of polysiloxane as prepolymer. The result was that when the characteristic viscosity was 54.5mpas, the damping property was optimal. Using hydroxy-terminated ladder-like polysiloxane to replace some hydroxy-terminated single-chain polysiloxane, the result showed when the ratio...
|
PDF Full Text Request