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Realizing Crack Diagnosing and Self‐Healing by Electricity with a Dynamic Crosslinked Flexible Polyurethane Composite
Advanced Science ( IF 14.3 ) Pub Date : 2018-03-08 , DOI: 10.1002/advs.201800101 Wuli Pu 1 , Daihua Fu 1 , Zhanhua Wang 1 , Xinpeng Gan 1 , Xili Lu 1 , Li Yang 1 , Hesheng Xia 1
Advanced Science ( IF 14.3 ) Pub Date : 2018-03-08 , DOI: 10.1002/advs.201800101 Wuli Pu 1 , Daihua Fu 1 , Zhanhua Wang 1 , Xinpeng Gan 1 , Xili Lu 1 , Li Yang 1 , Hesheng Xia 1
Affiliation
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Combining self‐healing functions with damage diagnosing, which can achieve timely healing autonomously, is expected to improve the reliability and reduce life cycle cost of materials. Here, a flexible conductive composite composed of a dynamically crosslinked polyurethane bearing Diels–Alder bonds (PUDA) and carbon nanotubes (CNTs), which possess both crack diagnosing and self‐healing functions, is reported. The introduced dynamic Diels–Alder bonds endow the materials self‐healing function and the powder‐based preparation route based on the specially designed CNTs‐coated PUDA micropowders leads to the formation of segregated CNTs network, which makes the composite possess excellent mechanical properties and high conductivity. Because of the sufficient electrothermal and photothermal effect of CNTs, the composites can be healed rapidly and repeatedly by electricity or near‐infrared light based on the retro‐Diels–Alder reaction. An obvious color difference in the infrared thermograph resulting from the resistance difference between damaged and undamaged area can be observed when applying the voltage, which can be used for crack diagnosing. Using the same electrical circuit, the crack in the PUDA/CNTs composite can be noninvasively detected first and then be autonomously healed. The composites also exhibit a strain‐sensing function with good sensitivity and high reliability, thus will have potential applications in electronic strain sensors.
中文翻译：
利用动态交联柔性聚氨酯复合材料实现电裂纹诊断和自修复
将自愈功能与损伤诊断相结合，可以实现自主及时修复，有望提高材料的可靠性并降低生命周期成本。在此，报道了一种由动态交联的带有狄尔斯-阿尔德键（PUDA）的聚氨酯和碳纳米管（CNT）组成的柔性导电复合材料，该复合材料具有裂纹诊断和自修复功能。引入的动态Diels-Alder键赋予了材料自修复功能，并且基于专门设计的CNTs包覆PUDA微粉的粉末基制备路线导致了分离的CNTs网络的形成，使得复合材料具有优异的力学性能和高电导率。由于碳纳米管具有足够的电热和光热效应，基于逆狄尔斯-阿尔德反应，复合材料可以通过电或近红外光快速、重复地修复。施加电压时，可以在红外热像图中观察到由于损坏和未损坏区域之间的电阻差异而产生的明显色差，可用于裂纹诊断。使用相同的电路，PUDA/CNT复合材料中的裂纹可以首先被无创地检测到，然后自动修复。该复合材料还表现出应变传感功能，具有良好的灵敏度和高可靠性，因此在电子应变传感器方面将具有潜在的应用前景。
更新日期：2018-03-08
中文翻译：
利用动态交联柔性聚氨酯复合材料实现电裂纹诊断和自修复
将自愈功能与损伤诊断相结合，可以实现自主及时修复，有望提高材料的可靠性并降低生命周期成本。在此，报道了一种由动态交联的带有狄尔斯-阿尔德键（PUDA）的聚氨酯和碳纳米管（CNT）组成的柔性导电复合材料，该复合材料具有裂纹诊断和自修复功能。引入的动态Diels-Alder键赋予了材料自修复功能，并且基于专门设计的CNTs包覆PUDA微粉的粉末基制备路线导致了分离的CNTs网络的形成，使得复合材料具有优异的力学性能和高电导率。由于碳纳米管具有足够的电热和光热效应，基于逆狄尔斯-阿尔德反应，复合材料可以通过电或近红外光快速、重复地修复。施加电压时，可以在红外热像图中观察到由于损坏和未损坏区域之间的电阻差异而产生的明显色差，可用于裂纹诊断。使用相同的电路，PUDA/CNT复合材料中的裂纹可以首先被无创地检测到，然后自动修复。该复合材料还表现出应变传感功能，具有良好的灵敏度和高可靠性，因此在电子应变传感器方面将具有潜在的应用前景。
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