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以可逆加成-断裂链转移(RAFT)、引发转移终止(iniferter)活性自由基聚合相结合的方法,用一步法制备了不同分子量的大分子引发剂RAFT-PS-co-PCMSI(MI),并通过紫外光聚合诱导相分离法制备了以接枝聚合物为基体的聚合物分散液晶(PDLC)膜.研究了不同分子量的MI对PDLC的微观形貌,关闭状态透光率,阈值电压,饱和电压以及记忆效应等方面的影响.研究表明,降低PDLC中MI的分子量,会使得液晶微滴粒径增大,阈值电压(Vth)、饱和电压(Vsat)减小,记忆效应、关闭状态透光率升高.
RAFT-PS-co-PCMSI (MI) with different molecular weight was prepared in one step by a combination of reversible addition-fragmentation chain transfer (RAFT) and iniferter living radical polymerization. The polymer dispersed liquid crystal (PDLC) films with graft polymers as matrix were prepared by UV-induced phase separation method.The effects of MI with different molecular weights on the morphology of PDLC, light transmittance, threshold voltage, Saturation voltage and memory effect etc. The results show that reducing the molecular weight of MI in PDLC can increase the size of liquid crystal droplet, decrease the threshold voltage (Vth), decrease the saturation voltage (Vsat), memory effect, Luminous rate increased.