Recent Progresses in Side-on Liquid Crystalline Elastomers

Liu Xi-yang; Wang Xiao-gong

doi:10.11777/j.issn1000-3304.2017.17118

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Recent Progresses in Side-on Liquid Crystalline Elastomers

Feature Articles | 更新时间：2021-01-26

- Recent Progresses in Side-on Liquid Crystalline Elastomers
- Acta Polymerica Sinica Issue 10, Pages: 1549-1556(2017)
- 作者机构：
  
  清华大学化学工程系先进材料教育部重点实验室北京 100084
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17118
  CLC：
- Published：2017-10，
  
  Received：2 May 2017，
  
  Revised：25 May 2017，
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Liu Xi-yang, Wang Xiao-gong. Recent Progresses in Side-on Liquid Crystalline Elastomers. [J]. Acta Polymerica Sinica (10):1549-1556(2017)
DOI：

Liu Xi-yang, Wang Xiao-gong. Recent Progresses in Side-on Liquid Crystalline Elastomers. [J]. Acta Polymerica Sinica (10):1549-1556(2017) DOI： 10.11777/j.issn1000-3304.2017.17118.

摘要

液晶弹性体是交联型液晶大分子，兼具液晶取向有序性和交联聚合物熵弹性等特性，在传感器、触发器、微流体装置和仿生器件等方面具有很好的应用前景.制备液晶弹性体的微结构，探索其独特的刺激响应性，是目前液晶弹性体研究的重要方向.侧链液晶弹性体的液晶相态类型取决于其液晶基元和主链的连接方式.腰接型侧链液晶弹性体倾向于形成向列型液晶相，具有较快的响应速度和形变程度，是一类独特的液晶弹性体.本文重点介绍腰接型液晶弹性体微结构（如微米柱、微米线等）的制备；利用金纳米粒子的光热转换效应，实现液晶弹性体光响应性的新途径；以及腰接型侧链液晶弹性体仿生微结构的功能性等.同时还对该领域的发展前景进行了展望.

Abstract

This article highlights some recent progresses in side-on liquid crystalline elastomer (LCE) researches

including their preparation

functions and possible applications. LCEs are networks formed by lightly crosslinked liquid crystalline polymers

which show both liquid crystalline order of the mesogens and elasticity of the polymeric networks. Owing to their interesting properties

LCEs are highly competitive candidates as stimuli-responsive materials in sensors

actuators

microfluidics and biomimicking devices and other areas. Developing new microstructures and realizing better stimuli-responsive functions have drawn a wide range of attention in recent years. Side-on LCE is an important category of LCEs

in which mesogenic units are waist-connected to the backbone of a polymer

and the mesogens tend to form nematic phase within the polymer network. Fabrication of LCE microstructures is a newly developing area with great growth potential. Taking use of elastomer (PDMS) molds

soft-lithographic methods have been used to fabricate LCE microstructures

which include micropillars and microwires. Soft-lithography has proved to be a feasible way to prepare LCE microstructures as shown by previous studies. LCE capillary fabricated by homemade tubular liquid crystal cell has been developed and employed to mimic the peristaltic crawling locomotion of earthworms. Upon the motion of heat source outside along the capillary axis

a crawling speed of 0.31 mm s

-1

is achieved. The kinematics of the biomimetic locomotion has been studied and rationalized with a five-stage model. This crawling locomotion of the LCE capillary can be potentially applied in biomimetic miniature robots and so on. Gold nanorods (AuNRs)

which are different from commonly used azobenzene photochromic moieties and carbon nanotubes

have been incorporated into LCE networks to achieve light responsiveness. AuNRs possess advantages in durabiltiy and photothermal conversion efficiency compared with the others. By incorporating AuNRs in side-on LCEs

light-responsive LCE/AuNRs composites have been developed by taking use of the photothermal effect of AuNRs. With inclusion of less than 1 wt% of AuNRs

a fast (within 3 s) light actuation has been achieved in LCE/AuNR composite actuators upon laser irradiation. By employing LCE gel

the phase transition temperature of LC network is reduced and the light-responsive function at room temperature has been achieved by AuNRs. In this article

some challenges to develop novel microstructures and realize more efficient stimuli-responses by using side-on LCEs are also discussed from perspectives of the authors.

关键词

液晶弹性体腰接型微结构光响应

Keywords

Liquid crystalline elastomersSide-onMicrostructuresLight responsive

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