Control of Thermally Enhanced Photoinduced Reorientation of Polymethacrylate Films with 4-Methoxyazobenzene Side Groups by Irradiating with 365 and 633 nm Light and Annealing
Control of Thermally Enhanced Photoinduced Reorientation of Polymethacrylate Films with 4-Methoxyazobenzene Side Groups by Irradiating with 365 and 633 nm Light and Annealing
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DOI：
10.1021/ma049550y
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发表时间：
2004-06
期刊：
影响因子：
5.5
通讯作者：
E. Uchida;Tomoko Shiraku;H. Ono;N. Kawatsuki
中科院分区：
文献类型：
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作者：
E. Uchida;Tomoko Shiraku;H. Ono;N. Kawatsuki
本文描述了含4-甲氧基偶氮苯侧基的液晶聚甲基丙烯酸酯（PLC）薄膜的两种不同的热增强光诱导重定向技术。一种是基于光选择和E/Z光异构稳态旋转扩散的经典方法，即用线偏振光（LP）照射365 nm，然后在薄膜的液晶（LC）温度范围内退火。间隔片长度和照射剂量对定向方向有显著影响。对于间隔段较短的plc，可产生垂直于LP 365 nm光的电矢量(E)的面内定向，但对于间隔段较长的plc，主要是面外定向和小程度的面内定向。另一种是基于轴选择性z - e光异构的替代技术，使用LP 633 nm光和热增强的分子重定向。注册…
This paper describes two different techniques for thermally enhanced photoinduced reorientation of liquid crystalline polymethacrylate (PLC) films that contain 4-methoxyazobenzene side groups with various alkylene spacer lengths. One is the classical method based on photoselection and rotational diffusion in the steady state of the E/Z photoisomerization, which includes irradiating with linearly polarized (LP) 365 nm light and subsequently annealing in the liquid crystalline (LC) temperature range of the film. The spacer length and exposure dose significantly influence the reorientation direction. In-plane reorientation perpendicular to the electric vector (E) of the LP 365 nm light was generated for PLCs with short spacers, but out-of-plane reorientation with a small degree of in-plane reorientation was predominant for PLCs with long spacers. The other is an alternative technique based on an axis-selective Z-to-E photoisomerization using LP 633 nm light and thermally enhanced molecular reorientation. Reg...