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Regulation and control of discoloration efficiency of mechanochromic polyurethane elastomers by microstructure design

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Abstract

Regulation of the discoloration efficiency of mechanochromism materials is a big challenge to date. In this study, a series of polyurethane elastomers (PUEs) using dihydroxyspiropyran (SP2) as functional molecule with varied microstructure were synthesized. The mechanochromic behavior of PUEs and the relationship between it and the microstructure of PUEs was investigated. As a result, when SP2 was covalently bonded to PUE backbones, discoloration phenomenon was clearly detected and appears earlier in PUEs with higher microphase separation degree under stretching. On the other hand, the PUEs with ultralow microphase separation degree could hardly change color until the fracture of the materials. Therefore, the characteristic indigo blue appearance efficiency could be easily controlled (from 300 to 600% strain) by adjusting the microphase separation degree in these PUEs. The results will allow these materials to deal with broader stress range.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (no.52103013 and no.52173208) and Funding of Jiangsu Educational Committee (19KJB430042).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, Jiangsu, China

    Yue Wu, Xinping Huang, An Xie, Junliang Liu & Ming Zhang

  2. Testing Center of Yangzhou University, Yangzhou, 225002, Jiangsu, China

    Zhifeng Wang

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  1. Yue Wu
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  2. Xinping Huang
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  3. Zhifeng Wang
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  4. An Xie
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  5. Junliang Liu
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Correspondence to An Xie.

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Wu, Y., Huang, X., Wang, Z. et al. Regulation and control of discoloration efficiency of mechanochromic polyurethane elastomers by microstructure design. J Polym Res 30, 214 (2023). https://doi.org/10.1007/s10965-023-03607-8

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