基于螺吡喃和薁的机械力诱导变色高分子的研究  

A Mechanochromic Polymer Based on Spiropyran and Azulene Subunits

作　　者：曹晶明 王建辉[1] 陈于蓝 Jing-ming Cao;Jian-hui Wang;Yu-lan Chen(College of Science,Tianjin University,Tianjin 300354;College of Chemistry,State Key Laboratory of Supramolecular Structure and Materials,Jilin University,Changchun 130012)

机构地区：[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

出　　处：《高分子学报》2023年第9期1263-1271,共9页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号22275068)资助项目

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.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 

分 类 号：TQ334[化学工程—橡胶工业]