聚硅烷类嵌段共聚物的聚合反应动力学及相分离机理

Polymerization Kinetics and Phase Separation for Polysilane Block Copolymers

以聚甲基苯基硅烷为引发剂,在紫外光照下与乙烯基单体聚合形成聚硅烷类嵌段共聚物。基于聚合反应动力学模型,就单体、紫外光强、质量比对反应动力学参数以及嵌段长度的影响进行解析。进一步结合相分离观察的结果,分析了此类共聚物中发生相分离与否的影响因素。结果表明,光聚合后仅1000 s后碳嵌段平均长度就收拢于5~6个碳原子,硅元素嵌段平均长度也降低到2左右,表明此类材料未发生相分离,是适用于光波导领域的理想材料。

Polysilane based block copolymers were prepared by photopolymerization using poly（ methylphenylsilane）（ PMPS） as photo-radical initiator. Effects of monomer type,UV intensity and PMPS/monomers mass ratio on polymerization kinetics parameters and block length were evaluated by the self-build kinetic modeling. These results were analyzed together with the phase separation observations. Since the average number of carbon atoms per structural block decreases to 5 ~ 6 and the average number of silicon atoms per structural block decreases to about 2 after 1000 s of polymerization,no phase separation occurs. The results indicate that they are potential materials for optical waveguide applications.