Photoinduced molecular reorientation in photoreactive liquid crystalline copolymers in a phase retarder application
Photoinduced molecular reorientation in photoreactive liquid crystalline copolymers in a phase retarder application
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DOI：
10.1016/j.polymer.2011.10.013
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发表时间：
2011-11
期刊：
影响因子：
4.6
通讯作者：
N. Kawatsuki;H. Shoji;Kotaro Yamaguchi;M. Kondo;Kouki Tsubaki
中科院分区：
文献类型：
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作者：
N. Kawatsuki;H. Shoji;Kotaro Yamaguchi;M. Kondo;Kouki Tsubaki
合成了侧链分别以4-甲氧基苯基-4 ′-羟基肉桂酸酯（MPC）和4-羟基苯甲酸（BA）为端基的聚甲基丙烯酸酯共聚物。使用线性偏振紫外（LPUV）光和随后的退火对薄膜进行热增强光致协同分子重新取向。此外，低曝光能量（4-80 mJ cm−2）和退火温度（<140 °C）提供了具有大的重取向级（S > 0.5）的两个侧基的充分合作的分子重取向。调整共聚物组合物调整的双折射率（ε n）的均匀重新取向的膜在0.10和0.22之间，在517 nm。最后，制造了在三乙酰纤维素（TAC）膜基底上使用取向共聚物的相位延迟器（λ nd = 130 nm），其表现出高达140 °C的热稳定性。
Polymethacrylate copolymers, which have hexamethylene spacer groups terminated with 4-methoxyphenyl-4′-oxycinnamate (MPC) and 4-oxybenzoic acid (BA) in the side chain, were synthesized. Thin films underwent thermally enhanced photoinduced cooperative molecular reorientation using linearly polarized ultraviolet (LPUV) light and subsequent annealing. Moreover, low exposure energy (4–80 mJ cm−2) and annealing temperature (<140 °C) provided sufficient cooperative molecular reorientation of both side groups with a large reorientational order (S > 0.5). Tuning the copolymer composition adjusted the birefringence (∆n) of homogeneously reoriented films between 0.10 and 0.22 at 517 nm. Finally, a phase retarder (∆nd = 130 nm) using an oriented copolymer on a triacetylcellulose (TAC) film substrate, which exhibited a thermal stability up to 140 °C, was fabricated.