可拉伸胆甾相液晶弹性体的图案化及力致变色

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中图分类号：TB34 文献标志码：A

Patterning and Mechanochromism of Stretchable Cholesteric Liquid Crystal Elastomers

MIN Zheng， JI Bo， QIN Lang， YU Yanlei （Collge of Smart Materials and Future Energy，State Key Laboratory ofMolecular Engineering ofPolymers， Fudan University， Shanghai 200438， China）

Abstract：Cholesteric liquid crystal elastomer （CLCE） is a photonic crystal material with a periodic helical structure that combinesunique optical anisotropy with mechanical stimulus-responsive properties，demonstrating broadapplication prospects inflexible photonicdevices.However，the preparationof patterned CLCEstillfaces challenges.Based onthe thiolMichaeladditionreaction，thermochromiccholesteric liquidcrystaline oligomers （CLCO）with controllble degreesof polymerizationand varying chain lengths weresynthesized，andthe structure-propertyrelationship between their liquid crystal phase structure and structuralcolor was systematically explored.Utilzing the temperature-induced cholesteric-smectic phase transition effect，the structural colorof CLCOcanbe tuned tocover thethree primarycolors，red，green，and blue， within a wavelength range （Δλ） of 126nm .Patterned stretchable CLCE films were prepared through local photopolymerization at different temperatures. By further decreasing n （Acrylate） /n （Thiol）， the degree of polymerization ofCLCO was enhanced andthe croslinking densityofCLCE was reduced，resulting inan increase inits elongationatbreak to 20% and enabling force-induced color changesacross the visible spectrum.This study notonly provides new insights into the dynamic regulation and paterning of structural color in CLCE，but also establishes a material foundation for applications in information encryption and anti-counterfeiting.

Key words： cholesteric liquid crystal elastomers;structural color; oligomer；mechanochromism;patterning

胆甾相液晶弹性体（Cholesteric Liquid Crystal Elastomer，CLCE）是一类具有周期性螺旋结构的智能光子晶体材料，其独特性质源于小分子胆甾相液晶（CLC）的光学特性与聚合物网络力学性能的协同作用[12]。（剩余17916字）