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Synthesis and mesomorphic properties of fishbone‐like liquid crystalline polysilsesquioxanes, 3 . Fishbone‐like, azo‐based liquid crystalline polysilsesquioxane
Author(s) -
Xie Ping,
Wan Youzi,
Zhou Bisan,
Hou Jianang,
Dai Daorong,
Li Ze,
Liu Dongsheng,
Zhang Rongben
Publication year - 1996
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.1996.021970227
Subject(s) - mesophase , thermotropic crystal , hydrosilylation , liquid crystalline , liquid crystal , polymer chemistry , materials science , crystallography , texture (cosmology) , side chain , polymer , chemistry , catalysis , organic chemistry , composite material , optoelectronics , artificial intelligence , computer science , image (mathematics)
Homopolymeric H‐FP (FP: fishbone‐like, azo‐based liquid crystalline polysilsesquioxanes) and copolymeric C‐FP were synthesized by hydrosilylation reaction of a vinylterminated azo compound with a ladder‐like poly(hydrosilsesquioxane) (H‐T) and random poly(methylhydrosilsesquioxane) (MH‐T), respectively, in the presence of Cp 2 PtCl 2 (Cp: cyclopentadienyl) used as the catalyst. This new type of liquid crystalline polymers is thermotropic. With increasing temperature FP's first enter a mesophase showing a normal texture, and then some peculiar textures different from the ordinary mesophase appear at an elevated temperature showing some bright belts, lines and spots on the black background, which can be supposed to be a self‐organized structure originating from ladder‐like main chain aggregation or association via interaction between the mesomorphic side chains.