采用反向原子转移自由基聚合制备苯乙烯引转移终止剂活性大分子(MI),并通过光聚合诱导相分离法制备聚合物分散液晶(PDLC)膜,研究了MI含量和交联剂(HDDA)的含量对PDLC开态透光率、阈值电压(V_(th))、饱和电压(V_(sat))、记忆效应和对比度的影响.结果表明,当PDLC中的MI含量从5%增到10%时,开态透光率增加,而阈值电压(V_(th))、饱和电压(V_(sat))降低,记忆效应增强,对比度先增加,然后又降低;当PDLC中的FDDA含量从25%增加到90%时,开态透光率降低,V_(th)、V_(sat)增加,记忆效应减弱.
Polymer dispersed liquid crystal(PDLC) films were prepared by photopolymerization induced phase separation(PIPS) with macro-initiator(MI) synthesized by reverse atom-transfer radical polymerization(R-ATRP) and crosslinking agent 1, 6-hexanedioldiacrylate(HDDA).The effects of MI and HDDA concentration on transmittance, threshold voltage(V_(th)), saturated voltage(V_(sat)), memory effect and contrast ratio of PDLC were studied.It is found that the on-state transmittance and memory effect increased with the mass fraction of MI varied from 5% to 10%, while V_(th) and V_(sat) decreases.In addition, contrast ratio increases at first and then decreases later.When the mass fraction of HDDA increases from 25 % to 90 %, the transmittance and memory effect decreased, and the V_(th) and V_(sat) increase at the same time.
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