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Synthesis and mesomorphic properties of cholesteric elastomers based on chiral mesogenic crosslinking agent
Author(s) -
Hu JianShe,
Li Hao,
Liu Cong,
Zhang BaoYan,
Li YanXiang
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.26785
Subject(s) - mesogen , materials science , differential scanning calorimetry , monomer , elastomer , thermogravimetric analysis , thermal stability , polymer chemistry , phase (matter) , texture (cosmology) , polymer , fourier transform infrared spectroscopy , liquid crystal , crystallography , chemical engineering , organic chemistry , composite material , chemistry , liquid crystalline , thermodynamics , physics , image (mathematics) , artificial intelligence , computer science , engineering , optoelectronics
Abstract Six chiral monomers ( M 1 − M 6 ), and their corresponding polymers ( P 1 , P 4 ) and elastomers ( P 2 , P 3 , P 5 , P 6 ) derived from chiral mesogenic crosslinking agent were synthesized. The chemical structures of M 1 − M 6 were confirmed by FTIR and 1 H NMR spectroscopy. The structure‐property relationships of M 1 − M 6 and P 1 − P 6 were discussed. Their mesomorphic properties and phase behavior were investigated by differential scanning calorimetry (DSC), thermogravimetric analyses (TGA), polarizing optical microscopy (POM), and X‐ray diffractometer (XRD) measurements. All monomers obtained, except M 2 and M 5 , showed typical oily streaks texture and focal conic texture of cholesteric phase on heating and cooling cycles. The selective reflection of cholesteric monomers and elastomers shifted to the short wavelength region with increasing temperature. The elastomers P 2 and P 5 did not reveal the mesomorphic properties, and P 3 and P 6 showed cholesteric phase. TGA showed that P 1 − P 6 had a high thermal stability. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008