Synthesis and Photoresponsive Behavior of a Liquid-Crystalline Polymer with a 4-Ring Azotolane Moiety with Huge Birefringence
Synthesis and Photoresponsive Behavior of a Liquid-Crystalline Polymer with a 4-Ring Azotolane Moiety with Huge Birefringence
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DOI：
10.1080/15421400701680911
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发表时间：
2007-12
影响因子：
0.7
通讯作者：
K. Okano;A. Shishido;T. Ikeda
中科院分区：
文献类型：
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作者：
K. Okano;A. Shishido;T. Ikeda
合成了一种偶氮苯基直接连接到二苯乙炔（偶氮环戊烷）上的新型液晶聚合物（LCP）。LCP在宽的温度范围内（> 200°C）显示出结晶相。即使LCP含有长的偶氮环戊烷部分，也会发生反-顺光异构化和顺-反热异构化。LCP的均匀取向膜表现出极大的Δn值（在633 nm处为0.70）。当在LC相中用泵浦光照射时，由于偶氮戊环部分的均匀排列的破坏，引起Δn的大的变化。
A novel liquid-crystalline polymer (LCP) containing an azobenzene group directly connected to a tolane moiety (azotolane moiety) was synthesized. The LCP showed a nematic phase in a broad temperature range (> 200°C). Trans-cis photoisomerization and cis-trans thermal isomerization occurred even though the LCP contains a long azotolane moiety. The homogeneously aligned film of the LCP exhibited an extremely large value of Δn (0.70 at 633 nm). Upon irradiation with a pumping beam in the LC phase, a large change in Δn was induced due to destruction of the homogeneous alignment of the azotolane moieties.