Mechanochromism of polyurethane based on folding-unfolding of cyano-substituted oligo(p-phenylene)vinylene dimer
作者机构：School of Materials Science and EngineeringNanjing Institute of TechnologyNanjing 211167China Jiangsu Key Laboratory of Advanced Structural Materials and Application TechnologyNanjing 211167China
出 版 物：《Frontiers of Materials Science》 (材料学前沿（英文版）)
年 卷 期：2023年第17卷第2期
页 面：169-180页
核心收录：
学科分类：07[理学] 070303[理学-有机化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
基 金：This work was financially supported by the National Natural Science Foundation of China(Grant Nos.52103141 and 51803090) the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20181025 and BK20191022)for financial support.
主 题：mechanochromism molecular tweezer folding-unfolding cyanosubstituted oligo(p-phenylene)vinylene polyurethane
摘 要：The incorporation of mechanophores,motifs that transform mechanical stimulus into chemical reaction or optical variation,allows creating materials with stressresponsive properties.The most widely used mechanophore generally features a weak bond,but its cleavage is typical an irreversible process.Here,we showed that this problem can be solved by folding–unfolding of a molecular tweezer.We systematically studied the mechanochromic properties of polyurethanes with cyano-substituted oligo(p-phenylene)vinylene(COP)tweezer(DPU).As a control experiment,a class of polyurethanes containing only a single COP moiety(MPU)was also prepared.The DPU showed prominent mechanochromic properties,due to the intramolecular folding–unfolding of COP tweezer under mechanical stimulus.The process was efficient,reversible and optical detectable.However,due to the disability to form either intramolecular folding or intermolecular aggregation,the MPU sample was mechanical inert.
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