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Enhanced Photoluminescence, Mesomorphism and Conformation of Liquid‐Crystalline Conjugated Polymers with Terphenyl Mesogen Pendants
Author(s) -
Chen Lie,
Chen Yiwang,
Zhou Dan,
Li Fan,
Zha Daijun,
Yao Kai
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000388
Subject(s) - mesogen , terphenyl , polythiophene , alkoxy group , steric effects , liquid crystal , conjugated system , thermal stability , materials science , polymer chemistry , polymer , side chain , photoluminescence , polyacetylene , crystallography , chemistry , organic chemistry , alkyl , conductive polymer , liquid crystalline , optoelectronics
A variety of LCCPs containing terphenyl pendants based on polyacetylene, polythiophene, poly( p ‐phenylene) and a poly( p ‐phenylene) copolymer backbone have been synthesized. The effects of the structural variation on their properties, especially their mesomorphism, photoluminescence and secondary structures, were studied systematically. Longer alkoxy spacer favor stronger light emission and better mesomorphism. Disubstituted polyacetylenes show better developed mesomorphic textures, higher quantum yields and better thermal stability than their corresponding monosubstituted analogs. Steric effects and the “jacket‐ effect” from the mesogens cause the bulky terphenyl mesogen pendants to rotate around the main chain and force the main chain to assume a spiral conformation along the main chain in long range.