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New photo‐crosslinkable side‐chain liquid‐crystalline methacrylate polymers comprising m‐[4′‐(n‐cinnamoyloxyalkoxy)biphenyl‐4‐yloxy]alkyl groups (m, n = 2, 6) were synthesized. All polymers exhibit a nematic liquid‐crystalline phase depending on the spacer length (5a–5d). Aligned thin films could be obtained using a rubbed polyimide‐coated substrate, and they could be photo‐crosslinked without change in the aligned structure. The photo‐crosslinked film of 5d (m = n = 6) showed a stable alignment up to 300°C.
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Kawatsuki et al. (1996) studied this question.
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