液晶与显示2026，Vol.41Issue(4)：473-481,9.DOI:10.37188/CJLCD.2026-0049
具有宽范围热致变色的胆甾相液晶薄膜
Cholesteric liquid crystal films with wide-range thermochromism
摘要
Abstract
Cholesteric liquid crystal elastomers(CLCEs)have attracted considerable attention in smart color-changing materials owing to their unique helical structures and tunable optical responses.However,the thermal color-change range of CLCEs is often limited by the constraints of the polymer network,resulting in a relatively narrow color-change range or requiring elevated temperatures to achieve significant optical variation.In this work,a series of cholesteric liquid crystal films(CLCFs)with varying crosslinking densities were prepared by introducing different amounts of the chain extender EDDET.The influence of crosslinking density on both thermochromic and mechanochromic behaviors was systematically investigated.Increasing the EDDET content effectively reduces the crosslinking density,leading to a significantly broadened thermochromic range.Within 20～100℃,a maximum red shift of 259 nm in the reflection wavelength was observed.Meanwhile,the thermal sensitivity was markedly enhanced,reaching a local maximum of 8.2 nm·℃-1 in the 60～80℃range.Mechanical tests reveal that lower crosslinking density improves the elongation at break and enlarges the strain-induced blue-shift range.After pre-stretching treatment,the thermally induced wavelength shift of the CLCF can be extended to 340 nm,with an average thermal sensitivity of 4.31 nm·℃-1.These CLCFs,featuring a wide thermochromic range and high sensitivity,are promising candidates for smart sensing,information encryption,and wearable optical devices.关键词
胆甾相液晶/聚合物/热致变色/光学传感Key words
cholesteric liquid crystal/polymer/thermochromism/optical sensing分类
数理科学引用本文复制引用
赵嵩岚,李傲天,朱吉亮,周璇..具有宽范围热致变色的胆甾相液晶薄膜[J].液晶与显示,2026,41(4):473-481,9.基金项目
河北省自然科学基金(No.A2023202010,No.F202202017)Supported by National Natural Science Foundation of Hebei Province(No.A2023202010,No.F202202017) （No.A2023202010,No.F202202017）
