The influence of charged ions on the electro-optical properties of polymer-dispersed liquid crystal films prepared by ultraviolet-initiated cationic polymerization
The influence of charged ions on the electro-optical properties of polymer-dispersed liquid crystal films prepared by ultraviolet-initiated cationic polymerization
复制标题
DOI：
10.1063/1.4745907
复制
发表时间：
2012-08
影响因子：
3.2
通讯作者：
Ping Song;Lilong Yu;Ai-Hong Jiao;Feifei Wang;Fang Liu;Cuihong Zhang;C. Yang;H. Cao;Huai Yang
中科院分区：
文献类型：
--
作者：
Ping Song;Lilong Yu;Ai-Hong Jiao;Feifei Wang;Fang Liu;Cuihong Zhang;C. Yang;H. Cao;Huai Yang
以紫外光（UV）引发剂UVI-6974为引发剂，采用阳离子聚合法制备了环氧树脂基聚合物分散液晶（PDLC）薄膜。由UV引发剂的光解产生的带电离子保留在聚合物基质的液晶（LC）液滴中。基于PDLC膜的光学器件从电场诱导的LC液滴的重新取向获得其功能特性。这些离子掺杂的PDLC薄膜显示出不同的液晶分子的重新取向和电光性能比那些没有离子掺杂剂制备。当在这些PDLC膜上施加电场时，LC液滴中的带电离子在电场的诱导下沿着电场的方向迁移，并在LC液滴/聚合物界面处聚集。针对上述情况，本文建立了液晶液滴/聚合物界面双电层模型。这一现象是由于双电层的存在抵消了电场的作用。
Polymer-dispersed liquid crystal (PDLC) films based on epoxy resins were prepared by UV-initiated cationic polymerization using UVI-6974 as UV-initiator. The charged ions arose from photolysis of the UV-initiator remained in the liquid crystal (LC) droplet of the polymer matrix. Optical devices based on PDLC films derive their functional properties from the electric field induced reorientation of LC droplets. These PDLC films doped with ions showed different reorientation of LC molecules and electro-optical properties than those prepared without ionic dopants. When an electric field was applied across these PDLC films, the charged ions in the LC droplet migrated along the direction of the electric field in inducement of the electric field and assembled at the LC droplet/polymer interface. According to the situation mentioned above, the model of charged double layers at the LC droplet/polymer interface was set up in our study. The behavior was attributed to the charged double layers that cancel the field s...