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Synthesis and lyotropic behavior of mesogen‐linked cellulose acetates
Author(s) -
Wu Changcheng,
Gu Qincui,
Zhang Rongben,
Huang Yong,
Chen Shouxi
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20253
Subject(s) - mesogen , thermotropic crystal , lyotropic , benzoic acid , chemistry , polymer chemistry , organic chemistry , liquid crystal , cellulose , dichloroacetic acid , materials science , liquid crystalline , polymer , optoelectronics
Three aromatic ( p ‐carboxyl phenyl) esters, 4‐(benzoyloxy) benzoic acid, 4‐(4′‐methylbenzoyloxy) benzoic acid, and 4‐(4′‐chlorobenzoyloxy) benzoic acid, were synthesized and they showed nematic monotropic or thermotropic behavior. The mesogen‐linked cellulose acetates were first prepared by the reaction of aromatic ( p ‐carboxyl phenyl) esters with cellulose acetate through esterification in the presence of N , N ‐dicyclohexylcarbodiimide (DCC) and 4‐dimethylaminopyridine (DMAP). Their degrees of mesogenic unit substitution (DS ‐meso ) were between 0.27 and 0.41. It was found that they can form cholesteric lyotropic phases in dichloroacetic acid and their critical concentration was about 25 wt %. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2693–2697, 2004