偶氮苯
光异构化
材料科学
侧链
液晶
嬉戏
聚合物
聚合
高分子化学
化学工程
光电子学
异构化
复分解
化学
复合材料
有机化学
催化作用
工程类
作者
Jian Chen,Tianchi Xu,Weiguang Zhao,Lingling Ma,Dongzhong Chen,Yanqing Lu
出处
期刊:Polymer
[Elsevier]
日期:2021-03-01
卷期号:218: 123492-123492
被引量:13
标识
DOI:10.1016/j.polymer.2021.123492
摘要
Azobenzene-containing polymers (azopolymers) are a kind of intensively explored fascinating photoresponsive materials, liquid crystalline (LC) azopolymers with excellent film-forming, ordered structure and self-repairing capability are endowed with enhanced photoisomerization and photoalignment characteristics capable of developing into photo-modulated smart surfaces. Here in this work, two azobenzene side-chain LC polynorbornenes of PNB-Azo-n with different DP of n = 50 and 100 have been well synthesized through ring-opening metathesis polymerization (ROMP). The polynorbornene backbone of less flexibility with larger spacing between adjacent azobenzene side groups endows stronger inhibition for H-aggregation and better photoresponsiveness. The high-DP azopolynorbornene of PNB-Azo-100 thin films well behave as command surface for the upper layer nematic LC molecules thanks to their better performance in photoisomerization and photoalignment, together with their good compatibility and dissolution-resistance to the nematic LC mixture of E7. Selectively optically readable LC graphic writings at normal size through various photomasks have been demonstrated, and higher grid resolution up to sub-ten micrometer with a digital micromirror device (DMD) based dynamic photopatterning system has been achieved. Therefore, such kind of LC azopolynorbornenes demonstrate promising applications in LC photoalignment system and photoresponsive devices for potential anti-forgery document security and smart card technology.
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