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Synthesis and phase behavior of cholesteric liquid crystal polymers containing glutamic acid in main‐chain
Author(s) -
Zhang BaoYan,
Zhang LiFeng,
Tian Mei,
Xiao WenQiang,
Guan Yan
Publication year - 2007
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.25027
Subject(s) - mesophase , differential scanning calorimetry , polymer , monomer , polymer chemistry , materials science , thermogravimetric analysis , side chain , liquid crystal , phase (matter) , condensation polymer , chemical engineering , organic chemistry , chemistry , composite material , physics , optoelectronics , engineering , thermodynamics
Four polymers ( P 0 – P 3 ) containing peptide chain as polymer backbone were synthesized by condensation reaction with bis(trichloromethyl)carbonate and triethylamine. The chemical structures of the monomers M 0 – M 3 were confirmed by FTIR and 1 H‐NMR. The structure–property relationships of the monomers and polymers are discussed. Their phase behavior and optical properties were investigated by differential scanning calorimetry, thermogravimetric analysis, and polarizing optical microscopy. Monomers M 1 – M 3 and polymers P 1 – P 3 displayed cholesteric phases. The results demonstrated that the melt temperature and clear point of monomers ( M 1 – M 3 ) and polymers ( P 1 – P 3 ) decreased with the increase of the flexible spacer length in the side‐chain, and the mesophase temperature range of the polymers increased with the increase of the flexible spacer length. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007
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