A Mechanochromic Polymer Based on Spiropyran and Azulene Subunits

Jing-ming Cao; Jian-hui Wang; Yu-lan Chen

doi:10.11777/j.issn1000-3304.2023.23125

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A Mechanochromic Polymer Based on Spiropyran and Azulene Subunits

Rapid Communication | 更新时间：2023-08-21

- A Mechanochromic Polymer Based on Spiropyran and Azulene Subunits
  增强出版
- ACTA POLYMERICA SINICA Vol. 54, Issue 9, Pages: 1263-1271(2023)
- 作者机构：
  
  1.天津大学理学院天津 300354
  2.吉林大学化学学院超分子结构与材料国家重点实验室长春 130012
- 作者简介：
  
  Jian-hui Wang, E-mail: wjh@tju.edu.cn
  Yu-lan Chen, E-mail: yulan.chen@tju.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2023.23125
  CLC：
- Published：20 September 2023，
  
  Published Online：30 June 2023，
  
  Received：06 May 2023，
  
  Accepted：23 May 2023
扫描看全文
曹晶明,王建辉,陈于蓝.基于螺吡喃和薁的机械力诱导变色高分子的研究[J].高分子学报,2023,54(09):1263-1271.

Cao Jing-ming,Wang Jian-hui,Chen Yu-lan.A Mechanochromic Polymer Based on Spiropyran and Azulene Subunits[J].ACTA POLYMERICA SINICA,2023,54(09):1263-1271.
曹晶明,王建辉,陈于蓝.基于螺吡喃和薁的机械力诱导变色高分子的研究[J].高分子学报,2023,54(09):1263-1271. DOI： 10.11777/j.issn1000-3304.2023.23125.

Cao Jing-ming,Wang Jian-hui,Chen Yu-lan.A Mechanochromic Polymer Based on Spiropyran and Azulene Subunits[J].ACTA POLYMERICA SINICA,2023,54(09):1263-1271. DOI： 10.11777/j.issn1000-3304.2023.23125.

摘要

利用螺吡喃和薁这两类染料的刺激响应性和光学活性，设计合成了以薁为核、双螺吡喃取代的新型力敏团SP-Az-SP，并通过缩聚反应，制备了含SP-Az-SP的嵌段聚氨酯弹性体. 对小分子力敏团在酸碱刺激、光照以及对弹性体在受力条件下的光学性质进行了系统的研究，发现了SP-Az-SP溶液对多重刺激具有正交响应性质，形成的螺吡喃开环产物呈现优异可调的生色效应. 含SP-Az-SP的聚氨酯也表现出灵敏的力诱导变色性质，证明了螺吡喃和薁基元的耦合在开发多重刺激响应性高分子材料及调控机械力诱导变色高分子的光学信号灵敏度方面的可行性，其有望应用于高对比度的光学应力探测和指示等领域.

Abstract

We report a new kind of mechanophore and the corresponding polyurethane that exhibit a vividly detectable mechanochromism. Such optical features rely on the synergistic coupling of an azulene (Az) core and two spiropyran (SP) units into one chromophore. The use of the acid-

and light-induced chromogenic ring-opening reactions of SP and the acid-induced protonation reaction of Az reveals that the three subunits in this mechanophore can be activated orthogonally

thus generating switchable optical responses with high color contrast. The polyurethane is mechanically activated using sonication (in solution state) and tensile deformation (in bulk state)

which exhibits a green-to-blue mechanochromism. Due to its excellent mechanochromism

the mechanochromic polymer shows great potential in stress sensing and damage detection. Our strategy based on the coupling of multi-responsive organic dyes into one chromophore will open a new avenue to regulate the sensitivity of mechanochromophores

and to develop the stimuli-responsive materials with multiple functions.

关键词

机械力诱导变色高分子光致变色酸致变色螺吡喃薁聚氨酯

Keywords

Mechanochromic polymersPhotochromismAcid induced chromismSpiropyranAzulenePolyurethane

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