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首页> 外文期刊>Journal of Polymers and the Environment >Triple Roles of Thermoplastic Polyurethane in Toughening, Accelerating and Enhancing Self-healing Performance of Thermo-reversible Epoxy Resins
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Triple Roles of Thermoplastic Polyurethane in Toughening, Accelerating and Enhancing Self-healing Performance of Thermo-reversible Epoxy Resins

机译：热塑性聚氨酯在增韧，加速和增强热可逆环氧树脂的自愈合性能中的三重作用

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摘要

Cracks in polymers can be healed by endowing materials with self-healing performance. Cracks in epoxy resins containing thermo-reversible Diels-Alder bonds (EP-DA) can be self-healed via different heat treatments. However, EP-DA exhibits the disadvantages of brittleness and poor impact resistance yet as that existed in the common epoxy resins, and which limits the application of thermo-reversible self-healing epoxy resins. Herein, thermoplastic polyurethane (TPU) was introduced into EP-DA for the purpose of reducing the brittleness and improving the impact resistance of EP-DA. Meanwhile, it was expected that the self-healing performance of EP-DA could not be affected evidently. Results showed that the impact resistance of EP-DA had been improved greatly as expected upon TPU modification. More importantly, instead of affecting the self-healing performance of EP-DA, the self-healing speed of EP-DA was accelerated evidently by the incorporation of TPU. On the other hand, the healing efficiency of EP-DA was also enhanced markedly. In fact, TPU-modified EP-DA was repaired by dual actions of thermo-reversible DA reaction and thermal movement of thermoplastic polymer chains. In addition, TPU-modified EP-DA could also be healed for many damage-repair cycles. Therefore, thermoplastic polyurethane played a triple role as toughening, accelerating and enhancing self-healing performance of thermo-reversible epoxy resins.
机译：聚合物中的裂缝可以通过赋予具有自我愈合性能的材料来愈合。含有热可逆Diels-Alder键（EP-DA）的环氧树脂中的裂缝可以通过不同的热处理自愈。然而，EP-DA表现出脆性和抗冲击性差的缺点，尚不存在于共同的环氧树脂中的缺陷性，并且限制了热可逆的自我愈合环氧树脂的应用。这里，将热塑性聚氨酯（TPU）引入EP-DA中，以降低脆性并改善EP-DA的抗冲击性。同时，预计EP-DA的自我愈合性能不会显然不会影响。结果表明，由于TPU改性，EP-DA的抗冲击性大大提高了。更重要的是，而不是影响EP-DA的自我愈合性能，通过掺入TPU，显然，EP-DA的自愈速度被加速。另一方面，EP-DA的愈合效率也显着增强。实际上，通过热可逆DA反应的双重作用和热塑性聚合物链的热运动来修复TPU改性的EP-DA。此外，TPU修改的EP-DA也可以为许多损坏修复周期愈合。因此，热塑性聚氨酯在增韧，加速和增强热可逆环氧树脂的自愈合性能下起三重作用。

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