N. Kawatsuki et al., SYNTHESIS AND PHOTO-CROSS-LINKING OF ORIENTED SIDE-CHAIN LIQUID-CRYSTALLINE POLYMERS, Macromolecular rapid communications, 17(10), 1996, pp. 703-712
New photo-crosslinkable side-chain liquid-crystalline methacrylate pol
ymers comprising m-[4'-(n-cinnamoyloxyalkoxy)biphenyl-4-yloxy]alkyl gr
oups (m, n = 2, 6) were synthesized. All polymers exhibit a nematic li
quid-crystalline phase depending on the spacer length (5a-5d). Aligned
thin films could be obtained using a rubbed polyimide-coated substrat
e, and they could be photo-crosslinked without change in the aligned s
tructure. The photo-crosslinked film of 5d (m = n = 6) showed a stable
alignment up to 300 degrees C.