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Substituent Effects Control Spiropyran–Merocyanine Equilibria and Mechanochromic Utility
Macromolecular Rapid Communications ( IF 4.6 ) Pub Date : 2020-12-03 , DOI: 10.1002/marc.202000597
Michael Sommer 1
Affiliation  

Spiropyran (SP) derivatives can be converted into the colored merocyanine (MC) form using a variety of triggers. Optical switching by light for memories and dynamic systems is long known. Recently, mechanical force has been reported as an additional stimulus that converts SP into MC. SP‐based mechanochromic systems are especially interesting for polymer scientists, as the covalent attachment of polymer chains is ideal to transduce force to the SP level. Whether such materials are investigated to better understand fundamental processes or long standing questions in polymer science, to design force sensors or to self‐report damage, or simply pose fascinating materials which turn colored upon deformation, they have intrigued polymer scientists for more than a decade. With the chemistry of SPs being feasible and SP functionalization important to modulate SP/MC equilibria, a significant amount of work on SP structure‐ mechanochromic function relations has accumulated. SPs can be used as bifunctional initiators, cross‐linkers, monomers, or be synthesized during polymerization. This feature article provides an overview of how the chemistry used sets the boundaries within which the mechanochromic response of SP containing polymers can be modulated.

中文翻译:

取代基效应控制螺吡喃-花菁平衡和机械变色效用

螺吡喃(SP)衍生物可以使用多种引发剂转化为有色的花菁(MC)形式。存储器和动态系统通过光进行光交换是众所周知的。最近,据报道机械力是将SP转换为MC的附加刺激。基于SP的机械变色系统特别受聚合物科学家的欢迎,因为聚合物链的共价连接是将力传递至SP水平的理想选择。无论是为了更好地理解聚合物科学中的基本过程或长期存在的问题而研究此类材料,还是设计力传感器或自我报告的损坏,或者只是摆出引人注目的变形后会变色的迷人材料,它们都使聚合物科学家们产生了十多年的兴趣。 。由于SP的化学性质是可行的,并且SP官能化对于调节SP / MC平衡很重要,因此关于SP结构-机械变色功能关系的大量工作已经积累起来。SP可用作双功能引发剂,交联剂,单体,或在聚合过程中合成。这篇专题文章概述了使用的化学方法如何设置边界,可以在其中调节含SP聚合物的机械变色响应。
更新日期:2021-01-08
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