Polymers for Photoinduced Reversible Solid-to-Liquid Transitions

Chen-rui Yuan; Wen-cong Xu; Shuo-feng Liang; Si Wu

doi:10.11777/j.issn1000-3304.2020.20112

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Polymers for Photoinduced Reversible Solid-to-Liquid Transitions

更新时间：2021-01-26

- Polymers for Photoinduced Reversible Solid-to-Liquid Transitions
- Acta Polymerica Sinica Vol. 51, Issue 10, Pages: 1130-1139(2020)
- 作者机构：
  
  中国科学技术大学中国科学院软物质化学重点实验室合肥微尺度物质科学国家研究中心高分子科学与工程系　合肥 230026
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2020.20112
  CLC：
- Published：1 September 2020，
  
  Published Online：30 July 2020，
  
  Received：27 April 2020，
  
  Revised：22 May 2020，
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Chen-rui Yuan, Wen-cong Xu, Shuo-feng Liang, Si Wu. Polymers for Photoinduced Reversible Solid-to-Liquid Transitions. [J]. Acta Polymerica Sinica 51(10):1130-1139(2020)
DOI：

Chen-rui Yuan, Wen-cong Xu, Shuo-feng Liang, Si Wu. Polymers for Photoinduced Reversible Solid-to-Liquid Transitions. [J]. Acta Polymerica Sinica 51(10):1130-1139(2020) DOI： 10.11777/j.issn1000-3304.2020.20112.

摘要

一些偶氮苯高分子可以在室温下发生光致可逆固液转变. 这些高分子中的偶氮苯基团能发生光致可逆顺反异构. 反式偶氮苯高分子是玻璃化转变温度(

)高于室温的固体. 在紫外光照下，反式偶氮苯高分子异构成顺式结构；而顺式偶氮苯高分子是

低于室温的液体. 顺式偶氮苯高分子在可见光照或者加热下可逆回复至反式，实现可逆固液转变. 与热致的固液转变相比，光致固液转变具有更高的时空分辨率，这使得偶氮苯高分子在功能材料领域有重要的应用前景. 本文介绍了光致可逆固液转变的偶氮苯高分子，讨论了其转变机理和设计原则，并介绍了偶氮苯高分子在自修复材料、黏合剂、光致驱动器、转移印刷和压印等领域的潜在应用.

Abstract

Light can induce reversible solid-to-liquid transitions of some azobenzene-containing polymers (azopolymers). These kinds of azopolymers have photoswitchable glass transition temperature (

Trans

and

cis

isomers usually have different

. The

values of

trans

azopolymers are above room temperature

which are solids. On the contrary

cis

azopolymers are liquid with

values below room temperature.

Trans

-to-

cis

isomerization occurs by UV irradiation. Visible light or heat can induce

cis

-to-

trans

isomerization. The performance did not change after dozens of reversible cycles. Compared with heat-induced solid-to-liquid transition

photoinduced reversible solid-to-liquid transitions have higher spatiotemporal resolution. The mechanism of solid-to-liquid transition was discussed in this article. Side-chain azopolymers are most studied up to now. The results show that the length of spacer and alkyl tail of an azopolymer is the key factor of whether it shows photoinduced solid-to-liquid transition. Different structures of main chain azopolymers also affect photo isomerization

which could be efficiently constructed by reversible addition-fragmentation chain transfer polymerization (RAFT)

atom transfer radical polymerization (ATRP) and ring opening metathesis polymerization (ROMP). Azopolymers are widely used in self-healing materials

adhesives

photo-actuators

micro-actuators

transfer printing

nanoimprint

lithography

etc

. In this feature article

recent progress of azopolymers in photoinduced reversible solid-to-liquid transitions is reviewed

their potential applications are demonstrated

and the remaining challenges in this field are discussed.

关键词

高分子偶氮苯光致固液转变玻璃化转变温度光响应

Keywords

PolymersAzobenzenePhotoinduced solid-to-liquid transitionGlass transition temperaturePhotoresponsive

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Institute of Chemistry, Chinese Academy of Sciences

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Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

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