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Preparation of Liquid Crystal Film Capable of Shielding Visible Light Band by Two‐Phase Coexistence
Author(s) -
Li Erli,
Zhang Dongdong,
Cao Hui,
Chen Yinjie,
Zhao Limin,
Gan Ping,
Yang Zhou,
Wang Dong,
He Wanli
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20190133
Subject(s) - materials science , polymerization , cationic polymerization , phase (matter) , polymer , grain boundary , monomer , electromagnetic shielding , liquid crystal , reflection (computer programming) , twist , composite material , cholesteric liquid crystal , polymer chemistry , chemical physics , optics , optoelectronics , chemistry , microstructure , physics , organic chemistry , geometry , mathematics , computer science , programming language
A broadband reflective film covering the visible region is prepared by twice crosslinking polymerization of active monomer at different temperatures. The system is transformed from cholesteric phase to twist grain boundary A phase with the decrease of temperature. Based on the temperature dependence of pitch in two‐phase coexistence system, the polymer networks formed by free‐radical polymerization fix a part of small pitch when the system is in cholesteric phase at high temperatures, and then the large pitch is fixed by cationic polymerization when system is in twist grain boundary A phase at low temperatures. The non‐uniform distribution of pitch is formed in the system so that the reflection band of the film is broadened. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58 , 599–606