{'fraction_non_alphanumeric': 0.0255863539445629, 'fraction_numerical': 0.009594882729211088, 'mean_word_length': 5.475862068965517, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Synthesis of Side-Chain Liquid Crystal Polymers and Preliminary Studies of the Property of Photo-Alignment

Two kinds of photo-crosslinkable polymers with a coumarin-containing and cinnamate-containing side group were synthesized in this paper. The structure of the intermediates, monomers and polymers were characterized with FTIR and 1HNMR measurement. Differential scanning calorimetry (DSC), hot stage polarized optical microscopy (POM) were employed to study the phase-transition temperature, mesophase texture. UV-VIS spectrophotometer was used to survey the ultraviolet absorption performance of the polymers. The results showed that the monomer with cinnamate group showed nematic phase and smectic phase over a wide temperature range. What’s more, the ultraviolet absorption peak of the polymer with cinnamate group was at about 285 nm, and the ultraviolet absorption peak of the polymer with coumarin group was around 311.00 nm.