光致形变液晶高分子

卿鑫; 吕久安; 俞燕蕾

doi:10.11777/j.issn1000-3304.2017.17196

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光致形变液晶高分子

专论 | 更新时间：2021-01-26

- 光致形变液晶高分子
- Photodeformable Liquid Crystal Polymers
- 高分子学报 2017年第11期页码：1679-1705
- 作者机构：
  
  复旦大学材料科学系高分子国家重点实验室上海 200433
- 作者简介：
  
  [ "女, 1971年2月生.复旦大学材料科学系教授, 博导, 副系主任.1993年毕业于安徽大学化学系, 1996年获得中国科技大学材料科学与工程系硕士学位, 同年进入复旦大学材料科学系工作.2004年获得日本东京工业大学博士学位, 受聘为复旦大学材料科学系教授、博导.先后获评教育部新世纪优秀人才(2004年)、上海市曙光学者(2005年)、上海市青年科技启明星(2006年)、国家杰出青年(2012年)、上海市优秀学术带头人(2015年), 教育部长江学者特聘教授(2016年), 科技部中青年科技创新领军人才(2016年).主要从事液晶高分子和光响应性高分子的研究, 利用其构筑光致形变材料和光响应功能界面材料" ]
- 基金信息：
  
  国家自然科学基金(51225304);国家自然科学基金(21134003);国家自然科学基金(21273048);上海市优秀学术带头人计划(15XD1500600)
- DOI：10.11777/j.issn1000-3304.2017.17196
  中图分类号：
- 纸质出版日期：2017-11-20，
  
  收稿日期：2017-7-24，
  
  修回日期：2017-8-15，
扫描看全文
卿鑫, 吕久安, 俞燕蕾. 光致形变液晶高分子[J]. 高分子学报, 2017,(11):1679-1705.

Qing Xin, Lv Jiu-an, Yu Yan-lei. Photodeformable Liquid Crystal Polymers[J]. Acta Polymerica Sinica, 2017,(11):1679-1705.
卿鑫, 吕久安, 俞燕蕾. 光致形变液晶高分子[J]. 高分子学报, 2017,(11):1679-1705. DOI： 10.11777/j.issn1000-3304.2017.17196.

Qing Xin, Lv Jiu-an, Yu Yan-lei. Photodeformable Liquid Crystal Polymers[J]. Acta Polymerica Sinica, 2017,(11):1679-1705. DOI： 10.11777/j.issn1000-3304.2017.17196.

摘要

交联液晶高分子兼具液晶的各向异性和高分子网络的弹性，并且具有优异的分子协同作用.在交联液晶高分子中引入光响应基团，例如偶氮苯后，即可赋予其光致形变性能，利用分子协同作用可以将光化学反应引起的分子结构变化放大为宏观形变，从而将光能直接转化成机械能.通过合理的分子结构和取向设计可以使液晶高分子产生诸如伸缩、弯曲、扭曲、振动等多种形式的光致形变，并用于各类光控柔性执行器件的构筑，在人工肌肉、微型机器人、微量液体操控等领域呈现出独特的优势和广阔的应用前景.本文总结和评述了光致形变液晶高分子的研究，包括材料结构对光致形变性能的影响、新型可加工光致形变材料的研究、利用可见光和近红外光触发形变的策略，以及光致形变液晶高分子微执行器在微量液体操控中的应用，最后展望了该领域的发展方向.

Abstract

As a combination of polymer networks and liquid crystals

cross-linked liquid crystal polymers (CLCPs) exhibit unique properties such as elasticity

anisotropy

self-assembly and molecular cooperation effect. The most important point is that the orientation of liquid crystal (LC) mesogens is strongly coupled with the conformation of polymer backbones

thus change of LC arrangement by stimuli will generate shape change of the whole sample. The macroscopic deformation of CLCPs is reversible because the initial alignment of mesogens is memorized by network. Light is a particularly ideal stimulus since it is a clean energy with wide range of sources and can be precisely and conveniently manipulated in terms of wavelength

intensity and polarization direction. Incorporation of photochromic moieties

such as azobenzene moieties

into CLCPs enables photodeformation of the samples. The reversible

trans

cis

isomerization of azobenzenes upon specific light irradiation induces the change of LC order or LC director

and consequently leads to huge deformation of CLCPs. CLCPs containing azobenzene moieties can generate sophisticated movements including contraction/expansion

bending

oscillation and twisting

which directly convert photo energy into mechanical energy. Therefore

the photodeformable CLCPs are fabricated into various soft actuators by rational design

which brings about broad applications in artificial muscles

microrobots

microfluidics and so on. In this review

we mainly describe the development of azobenzene-containing CLCPs

and focus on the influence of molecular structures and alignment on the photodeformation behaviors. Started by introducing the mechanism of photodeformation involving photochemical phase transition and photoinduced reorientation

polyhydrosiloxane and polyacrylate CLCPs were described in details

with emphasis on the processable CLCPs and the novel methods to trigger deformation by visible light and infrared light. The applications of photodeformable CLCPs in the construction of diverse microscopic actuators ane microfluid manipulation are also described. An outlook of existing challenges and opportunities is also given at the end of this review.

关键词

智能材料液晶高分子光致形变偶氮苯执行器

Keywords

Smart materialLiquid crystal polymersPhotodeformableAzobenzeneActuators

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