Mechanoresponsive PS-PnBA-PS Triblock Copolymers via Covalently Embedding Mechanophore

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• 作者：Shengchao Jiang ; Lingxing Zhang ; Tingwan Xie ; Yangju Lin ; Huan Zhang ; Yuanze Xu ; Wengui Weng ; Lizong Dai
• 刊名：ACS Macro Letters
• 出版年：2013
• 出版时间：August 20, 2013
• 年：2013
• 卷：2
• 期：8
• 页码：705-709
• 全文大小：265K
• 年卷期：v.2,no.8(August 20, 2013)
• ISSN：2161-1653

文摘

A mechanically active spiropyran (SP) mechanophore is incorporated into the center of poly(n-butyl acrylate) (PnBA) block to construct a series of mechanoresponsive polystyrene (PS)-PnBA-SP-PnBA-PS triblock copolymers. Similar mechanical activations of SP occur in all of the copolymers in solution, whereas a unique PS fraction-dependent mechanochromism is observed in the bulk. Effective mechanical activation occurs in the copolymer with a medium PS block length, whereas a very weak color change is observed in the samples bearing low PS fractions and activation appears only in the vicinity of the fracture point in the copolymer bearing long PS blocks. The difference in chemical compositions of the triblock copolymers leads to different microphase separated structures in the bulk and consequently the unique stress鈥搒train responses and mechanochemistry. This platform promises to open way to the design of a wide range of useful mechanoresponsive triblock copolymers having different hard/soft blocks and various types of mechanoresponsive motifs.