大分子引发剂的主链柔性对PDLC电光性能的影响

徐奇; 周宗明; 张玉良; 汪映寒

doi:10.3788/YJYXS20132804.0484

您当前的位置：

首页 >

文章列表页 >

大分子引发剂的主链柔性对PDLC电光性能的影响

材料物理和化学 | 更新时间：2020-08-12

- 大分子引发剂的主链柔性对PDLC电光性能的影响
- Effect of Main-Chain Flexibility of Macro-Initiator on Electro-Optical Properties of Polymer Dispersed Liquid Crystal
- 液晶与显示 2013年28卷第4期页码：484-489
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  国家自然科学基金(No.50973067,No.51173115)();博士点基金(No.20110181110030)();四川大学学生创新实验项目()
- DOI：10.3788/YJYXS20132804.0484
  中图分类号： O753+.2
- 收稿日期：2013-05-20，
  
  修回日期：2013-06-22，
  
  纸质出版日期：2013-08-15
- 稿件说明：
移动端阅览
徐奇, 周宗明, 张玉良, 汪映寒. 大分子引发剂的主链柔性对PDLC电光性能的影响[J]. 液晶与显示, 2013,28(4): 484-489

XU Qi, ZHOU Zong-ming, ZHANG Yu-liang, WANG Ying-han. Effect of Main-Chain Flexibility of Macro-Initiator on Electro-Optical Properties of Polymer Dispersed Liquid Crystal[J]. , 2013,28(4): 484-489
徐奇, 周宗明, 张玉良, 汪映寒. 大分子引发剂的主链柔性对PDLC电光性能的影响[J]. 液晶与显示, 2013,28(4): 484-489 DOI： 10.3788/YJYXS20132804.0484.

XU Qi, ZHOU Zong-ming, ZHANG Yu-liang, WANG Ying-han. Effect of Main-Chain Flexibility of Macro-Initiator on Electro-Optical Properties of Polymer Dispersed Liquid Crystal[J]. , 2013,28(4): 484-489 DOI： 10.3788/YJYXS20132804.0484.

摘要

引入4种玻璃化温度不同的单体

通过可逆加成-断裂链转移和引发转移终止剂活性自由基聚合相结合的方法制备出不同主链柔性的活性接枝大分子引发剂MI

并用其制备了聚合物分散液晶膜

研究了MI的主链柔性对接枝聚合物为基体的PDLC电光性能的影响。研究发现

随着MI主链柔性增加

PDLC的关闭状态透光率、液晶微滴的粒径都是先减小后增大

并都在大分子引发剂为RAFT-P(BMA-co-CMSI)时有最小值;阈值电压、饱和电压均呈现了先增大后减小的变化趋势;但是滞后的变化却表现出多元化

这是由于滞后受到多种因素综合影响导致的。

Abstract

Polymer dispersed liquid crystal (PDLC) films were prepared with living graft macro-initiator (MI) with different main-chain flexibility

synthesized by reversible addition-fragmentation chain transfer (RAFT) and iniferter polymerization with four kinds of monomers with different glass transition temperature. The effect of main-chain flexibility of MIs on morphologies

transmittance

switching voltage and hysteresis of PDLC films based on graft polymer had been investigated. It was observed that the OFF-state transmittance (

OFF

) and the size of LC droplet decreased at first and then increased with the increase in main-chain flexibility of MIs

and both showed the lowest value when MI was RAFT-P(BMA-co-CMSI). However

and

sat

showed an opposite trend. It was found that the

value first increased from 8.0 V to 17.7 V and then decreased to 7.3 V

while the

sat

value first increased from 25.6 V to 32.9 V and then decreased to 20.2 V. In addition

the hyste-resis showed complex changes

due to a variety of factors. Therefore

the change of main-chain flexibility of MIs successfully improved the electro-optical properties of PDLC films based on graft polymer.

关键词

Keywords

references

Justice R S, Schaefer D W, Vaia R A, et al. Interface morphology and phase separation in polymer-dispersed liquid crystal composites [J]. Polymer, 2005, 46(12):4465-4473.[2] Wang P C, Macdiarmid A G. Integration of polymer-dispersed liquid crystal composites with conducting polymer thin films toward [J]. Displays, 2007, 28(3):101-104.[3] 秦爱林, 汪映寒. 多官能Iniferter制备聚合物分散液晶膜及其含量对电光性能的影响 [J]. 高分子学报, 2010, (7):870-875.[4] 张玉良, 秦爱林, 汪映寒. 大分子引发剂的分子量对接枝聚合物基体的PDLC电光性能的影响 [J]. 高分子学报, 2012, (5):534-538.[5] Lai J T,Filla D,Shea R. Functional polymers from novel carboxyl-terminated trithiocarbo- nates as highly efficient RAFT agents [J]. Macromolecules, 2002, 35(18):6754-6756.[6] Otsu T, Yamashita K, Tsuda K. Synthesis, reactivity, and role of 4-vinylbenzyl N,N-diethyldithiocarbamate as a monomer-iniferter in radical polymerization [J]. Macromolecules, 1986, 19(2):287-290.[7] 阎斌,王守廉,何杰,等. 聚合物结构对PDLC性能的影响 [J]. 液晶与显示, 2007, 22(2):129-133.[8] Yan B, He J, Wang Y H, et al. Modification of electro-optical properties of polymer dispersed liquid crystal films by iniferter polymerization [J]. European Polymer Journal, 2008, 44(3):952-958.[9] Xin D, Bin Y, Wang Y H. Influence of matrix glass transition temperature on the memory effect of polymer-dispersed liquid crystals [J]. J. Polym. Sci. Part B: Polym. Phys., 2010, 48(6):729-732.[10] Xin D, Bin Y, Wang Y H, et al. The improvement of electro-optical properties of polymer-dispersed liquid crystals using copolymer macroinitiator with different glass transition temperature [J]. J. Polym. Sci. Part A:Polym Chem., 2010, 48(23):5557-5561.[11] Bin Y, Jie H, Wang Y H, et al. Modification of electro-optical properties of polymer dispersed liquid crystal films by iniferter polymerization [J]. European Polymer Journal, 2008, 44(3):952-958.[12] Lackser A M, Margerum J D, Ramos E, et al. Droplet size control in polymer dispersed liquid crystal films [J]. SPIE Liquid Crystal Chemical, Physics, and Application, 1989, (1080):53-61.[13] Kim B K, Kim S H, Song J C. Polymer network liquid crystals from u.v. curable polyurethane acrylate [J]. Polymer, 1998, 39(24):5949-5959.[14] Sugimura A, Ishino D. Nematic director deformation induced by a periodic surface anchoring strength [J]. Thin Solid Films, 2003, 438-439(22):433-439.

浏览量

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

单体烷基链长度对聚合物分散液晶膜电光性能的影响

反应温度对亲核试剂引发点击化学制备聚合物分散液晶电光性能的影响

单体烷基链长度对聚合物分散液晶膜电光性能的影响

聚合单体对聚合物分散液晶薄膜视角电光特性的影响