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Preparation and reflectance properties of new cholesteric liquid crystalline copolymers containing cholesteryl group
Author(s) -
Guo Jinbao,
Liu Fang,
Zhang Lipei,
Cao Hui,
Yang Huai
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21223
Subject(s) - materials science , copolymer , liquid crystal , monomer , cholesteric liquid crystal , polymer , polarizer , polymer chemistry , diffusion , chemical engineering , fourier transform infrared spectroscopy , composite material , optics , birefringence , optoelectronics , physics , thermodynamics , engineering
In this study, a new family of side‐chain cholesteric liquid crystal copolymers derived from cholesterol substituents were synthesized. The chemical structures of the copolymers were validated by FTIR and 1 H NMR. A wide‐band reflective polarizer from the above copolymers with stable optical properties was developed. The pitch gradient was formed by molecular diffusion between adjacent liquid crystal layers based on these cholesteric copolymers with different pitch lengths, and the pitch gradient was further stabilized by UV crosslinking of the polymerizable monomers during the diffusion process. The stability of these systems as a function of time was investigated. The polymer network was validated by scanning electron microscopy and this network played an important role in stabilizing the pitch gradient of the system. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers