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Self-Healing Polyurethanes with Shape Recovery

机译：具有形状恢复功能的自修复聚氨酯

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摘要

Two new thermoresponsive self-healing polyurethanes (1DA1T and 1.5DA1T) based on the Diels-Alder (DA) reaction between furan and maleimide moieties are developed that use the shape-memory effect to bring crack faces into intimate contact such that healing can take place. Unlike other self-healing polymers, these polymers do not require external forces to close cracks but rather they use the shape-memory effect to autonomously close the crack. Both polyurethanes have a stable polymer structure and comparable mechanical properties to commercial epoxies. A differential scanning calorimeter is employed to check the glass transition temperature of the polymers as well as the DA and retro-DA (rDA) reaction temperatures. These DA and rDA reactions are confirmed with variable-temperature proton nuclear magnetic resonance. Healing efficiency is calculated using a measurement of the failure load from compact tension testing. The results show that the shape-memory effect can replace external forces to close two crack surfaces and the DA reaction can be repeatedly employed to heal the cracks.
机译：基于呋喃和马来酰亚胺部分之间的Diels-Alder（DA）反应，开发了两种新型的热响应性自修复聚氨酯（1DA1T和1.5DA1T），它们利用形状记忆效应使裂纹面紧密接触，从而可以进行修复。与其他自修复聚合物不同，这些聚合物不需要外力来闭合裂纹，而是利用形状记忆效应自动闭合裂纹。两种聚氨酯都具有稳定的聚合物结构和可与商业环氧树脂媲美的机械性能。差示扫描量热仪用于检查聚合物的玻璃化转变温度以及DA和逆向DA（rDA）反应温度。这些DA和rDA反应已通过变温质子核磁共振得到证实。使用紧凑型张力测试中失效负载的测量值来计算修复效率。结果表明，形状记忆效应可以代替外力来闭合两个裂纹表面，并且DA反应可以重复用于修复裂纹。

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  • 来源
    《Advanced Functional Materials》 |2014年第33期|5261-5268|共8页
  • 作者

    Yunseon Heo; Henry A. Sodano;

  • 作者单位

    Materials Science and Engineering University of Florida Gainesville, FL 32611, USA;

    Materials Science and Engineering University of Florida Gainesville, FL 32611, USA,Mechanical and Aerospace Engineering University of Florida Gainesville, FL 32611, USA;

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