偶氮苯
聚苯乙烯
异构化
辐照
材料科学
侧链
摩尔质量
液晶
吊坠组
聚合物
紫外线
高分子化学
光化学
化学
有机化学
光电子学
复合材料
物理
核物理学
催化作用
作者
Hyo Kang,Daeseung Kang,Jong‐Chan Lee
出处
期刊:Polymer
[Elsevier]
日期:2009-04-01
卷期号:50 (9): 2104-2112
被引量:20
标识
DOI:10.1016/j.polymer.2009.03.007
摘要
We synthesized a series of polystyrene derivatives having the dual photoreactive side moieties, 4-(4-cyanophenylazo)phenoxymethyl and methyl cinnamate-4-oxymethyl, for the application of photoalignment materials. Stable and homogeneous planar LC cells having pretilt angles adjustable from 0.5° to 5° were obtained from these polymer films having molar contents of cinnamate and azobenzene groups in the ranges of 100–80 and 0–20 mol%, respectively, through the irradiation of linearly polarized ultraviolet (LP-UV) light to crosslink the cinnamate groups, followed by the irradiation of linearly polarized visible (LP-Vis) light to induce the isomerization of the azobenzene groups. The electro-optical and LC alignment properties of the LC cells were found to be affected by the molar composition of the photoreactive side groups and the exposure energies of LP-UV and LP-Vis light.
科研通智能强力驱动
Strongly Powered by AbleSci AI