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液晶与显示 2009, 24(1) 48-51  ISSN:  CN

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器件制备技术及器件物理
大分子光引发剂及固化时间对PDLC膜光电性能的影响
董守梅;万欣瑞;张春梅;阎 斌;汪映寒
四川大学 高分子科学与工程学院 高分子材料工程国家重点实验室,四川 成都 610065
摘要

聚合物分散液晶膜(PDLC)是将液晶和聚合物混合得到的一种综合性能优异的膜材料。聚合物作为成膜材料,其固化过程是影响聚合物分散液晶膜电光特性的重要因素。实验采用原子转移自由基聚合法制备活性大分子引发剂,引发可聚合单体进行聚合,通过光引发聚合诱导相分离法制备PDLC膜。研究表明:采用该方法可以极大地改善PDLC的光电性能,并且通过改变固化时间可以调节PDLC的各项光电性能,随着固化时间的增加,PDLC阈值电压(Vth)、饱和电压(Vsat)都随之增加,膜关态透光率(TOFF)、开态透光率(TON)随之降低。

关键词 聚合物分散液晶膜   原子转移自由基聚合   光聚合诱导相分离   电光性能  
Effect of Macro-Initiator and Curing Time on Electro-Optical Properties of Polymer Dispersed Liquid Crystal
DONG Shou-mei;YAN Bin;WAN Xin-rui;ZHANG Chun-mei;WANG Ying-han
State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China, E-mail: wangyinghan@vip.sina.com
Abstract:

Polymer dispersed liquid crystal (PDLC), consisting of low molecular liquid crystal dispersed in a polymer matrix, is a kind of film-formation material with excellent electro-optical properties. In this paper, PDLC films were prepared by photo-polymerization induced phase separation (PIPS) which was initiated by macro-iniferter agent prepared by atom transfer radical polymerization. It was found that the macro-iniferter was an effective way to improve the electro-optical properties of PDLC films. In addition, the properties of PDLC could also be adjusted through the curing time. It is found that as the curing time increase,the contrast ratio and the driving voltages of the films increase, while the memory effect significantly decreases.

Keywords: polymer dispersed liquid crystal films   atom transfer radical polymerization   polymerization induced phase separation   electro-optical properties  
收稿日期 2008-08-15 修回日期 1900-01-01 网络版发布日期 2009-02-20 
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