Photodeformable Main-chain Crosslinked Liquid Crystal Polymer Fiber Actuators at Room Temperature

Xin Huang; Xin-lei Pang; Lang Qin; Yan-lei Yu

doi:10.11777/j.issn1000-3304.2022.22103

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Photodeformable Main-chain Crosslinked Liquid Crystal Polymer Fiber Actuators at Room Temperature

Research Article | 更新时间：2024-10-08

- Photodeformable Main-chain Crosslinked Liquid Crystal Polymer Fiber Actuators at Room Temperature
- ACTA POLYMERICA SINICA Vol. 53, Issue 11, Pages: 1324-1331(2022)
- 作者机构：
  
  复旦大学材料科学系聚合物分子工程国家重点实验室上海 200433
- 作者简介：
  
  Yan-lei Yu, E-mail: ylyu@fudan.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2022.22103
  CLC：
- Published：20 November 2022，
  
  Published Online：18 August 2022，
  
  Received：29 March 2022，
  
  Accepted：08 April 2022
- 稿件说明：
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黄鑫,庞馨蕾,秦朗等.室温光致形变主链型交联液晶高分子纤维执行器[J].高分子学报,2022,53(11):1324-1331.

Huang Xin,Pang Xin-lei,Qin Lang,et al.Photodeformable Main-chain Crosslinked Liquid Crystal Polymer Fiber Actuators at Room Temperature[J].ACTA POLYMERICA SINICA,2022,53(11):1324-1331.
黄鑫,庞馨蕾,秦朗等.室温光致形变主链型交联液晶高分子纤维执行器[J].高分子学报,2022,53(11):1324-1331. DOI： 10.11777/j.issn1000-3304.2022.22103.

Huang Xin,Pang Xin-lei,Qin Lang,et al.Photodeformable Main-chain Crosslinked Liquid Crystal Polymer Fiber Actuators at Room Temperature[J].ACTA POLYMERICA SINICA,2022,53(11):1324-1331. DOI： 10.11777/j.issn1000-3304.2022.22103.

摘要

将分别含有偶氮苯和苯甲酸苯酯的2种液晶单体与伯胺进行迈克尔加成反应，得到分子量可控的主链型液晶低聚物. 利用先熔融提拉、后自由基聚合的方法将低聚物制备成交联液晶高分子纤维. 液晶单体与伯胺之间的扩链反应有效地降低了高分子网络的交联密度，进而降低纤维的玻璃化转变温度. 同时，这种先拉伸、再聚合的方式将纤维的取向与交联过程分开，保证了纤维中的液晶基元沿拉伸方向呈规整排列. 因此，取向后的交联液晶高分子纤维可在室温下实现可逆光致弯曲形变，其最大弯曲角度接近60°，且弯曲方向可以通过改变光照方向进行调控. 这种形变幅度大、方向可控的主链型交联液晶高分子纤维有望推动光响应柔性执行器等领域的发展.

Abstract

Photodeformable crosslinked liquid crystal polymer fiber actuators have potential applications in soft robots and other fields. However

due to the limitations of processing methods

it is still a great challenge to fabricate fiber actuators that can undergo large and direction-controllable light-induced bending at room temperature. Here

the main-chain liquid crystal oligomer with controllable molecular weight is synthesized by the Michael addition reaction between primary amines and liquid crystal monomers containing azobenzene or phenyl benzoate mesogens

respectively. On the basis

the cross-linked liquid crystal polymer fiber is obtained through dip-drawing the melt oligomer followed by the radical polymerization. The chain extension reaction between the primary amine and liquid crystal monomers effectively decreases the crosslinking density of the polymer network

thus lowering the glass transition temperature. Meanwhile

the alignment and crosslinking processes are decoupled by the strategy that the oligomer is stretched first and then the polymerization is implemented

which ensures that mesogens in the fiber are aligned along the stretching direction. Accordingly

the aligned fiber exhibits reversible light-induced bending at room temperature

whose maximum bending angle is close to 60°

and furthermore the bending direction can be adjusted by the light irradiation direction. The main-chain crosslinked liquid crystal polymer fiber with large and direction-controllable deformation has great potential in the field of soft robots. In addition

the method of processing oligomers and then polymerizing actuators is expected to be combined with the template method and 3D printing to fabricate actuators with complex shapes

promoting the development of photoresponsive flexible actuators and other fields.

关键词

液晶高分子光致形变偶氮苯纤维

Keywords

Liquid crystal polymersPhotodeformationAzobenzenesFibers

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