手性液晶弹性体薄膜在单、双轴变形下的光学-黏弹性特性研究  

Optic-Viscoelastic Properties of Chiral Liquid Crystal Elastomer Films Under Uniaxial and Biaxial Deformation

作　　者：顾洁茹 余露 赵莹[1] 李辰喆 GU Jieru;YU Lu;ZHAO Ying;LI Chenzhe(School ofAerospace Engineering andApplied Mechanics,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学航空航天与力学学院,上海200092

出　　处：《力学季刊》2025年第1期51-63,共13页Chinese Quarterly of Mechanics

基　　金：浦江人才计划(22PJ1413200)。

摘　　要：手性液晶弹性体(ChiralLiquidCrystalElastomers,CLCE)因其能够选择性地反射特定波长的光,并具备优异的大变形能力,已逐渐成为一种具有广阔应用前景的柔性反射显示材料.研究表明,CLCE的光学呈色特性与局部应变密切相关,展现出显著的力-光耦合效应.作为一种软物质材料,CLCE具有黏弹性特征,其在变形过程中的力学响应表现出明显的时间依赖性.然而,目前对CLCE在单轴和双轴变形条件下光学与黏弹性耦合特性的系统研究仍较为匮乏.本文基于多轴光-力学测试平台,系统地研究了CLCE在单轴及等双轴变形条件下反射光谱的时间依赖特性.通过分析在应力松弛过程及不同加载速率下的光谱特性,基于拉伸指数黏弹性本构关系,改进并提出了一种适用于CLCE的光-黏弹性耦合唯象模型.该模型为进一步优化CLCE在智能光学器件中的应用提供了理论支持和实验依据.Chiral Liquid Crystal Elastomers(CLCE),with their ability to selectively reflect specific wavelengths of light and exhibit excellent large-deformation capabilities,have gradually become a promising flexible reflective display material.Studies show that the optical coloration properties of CLCE are closely related to local strain,displaying a significant force-optical coupling effect.As a soft material,CLCE possesses viscoelastic characteristics,resulting in a time-dependent mechanical response during deformation.However,systematic research on the optical and viscoelastic coupling properties of CLCE under uniaxial and biaxial deformation conditions remains limited.In this study,using a multi-axial opto-mechanical testing platform,we systematically investigate the time-dependent characteristics of the reflection spectrum of CLCE under uniaxial and equibiaxial deformation conditions.By analyzing the spectral properties under stress relaxation and different loading rates,we propose an improved phenomenological model for CLCE based on the stretched exponential viscoelastic constitutive relationship.This model provides theoretical support and experimental insights for further optimizing the application of CLCE in smart optical devices.

关 键 词：力响应显色材料 光力耦合 黏弹性 胆甾相液晶弹性体 手性液晶弹性体 

分 类 号：X125[环境科学与工程—环境科学] X126