Few thermoplastic polyurethane (TPU) blending materials are reported to tune shape‐memory capability, self‐healing ability, and recyclability as well as mechanical property due to the different requirement of phase morphologies. This work focuses on how reversible epoxy domains affect the structures and properties of TPUs that contain disulfide bonds in main chains. The blended epoxy oligomers with dangling furan groups are miscible with the TPU. Self‐healing efficiency can be improved by such miscible epoxy oligomers that are also beneficial for shape recovery but harmful for shape fixation. In the presence of bis(4‐maleimidophenyl)methane (BMI), crosslinked epoxy domains phase separate from the TPU matrix to form microscale domains after the Diels–Alder (DA) reaction between furan groups and maleimide groups in BMI. Elastic modulus and tensile strength of TPU are greatly improved in comparison with pristine TPU and TPU/epoxy blends without BMI. The phase‐separated domains deteriorate the self‐healing, and the presence of phase‐separated microdomains facilitates the shape fixation but deteriorates the shape recovery. This work is not only useful to further understand the relation between structures of polymer blends with intelligent features, but also offers a useful approach to adjust the properties and capabilities of TPU in a cost‐effective manner.

中文翻译：

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混合可逆环氧域对自愈/形状记忆热塑性聚氨酯结构和性能的影响

据报道，由于相形态的不同要求，很少有热塑性聚氨酯（TPU）共混材料能调节形状记忆能力，自愈能力，可回收性以及机械性能。这项工作着眼于可逆的环氧域如何影响在主链中包含二硫键的TPU的结构和性能。具有悬挂呋喃基团的混合环氧低聚物可与TPU混溶。这种可混溶的环氧低聚物可以提高自我修复效率，这些低聚物也有利于形状恢复，但对形状固定有害。在存在双（4-马来酰亚胺基苯基）甲烷（BMI）的情况下，BMI中呋喃基团和马来酰亚胺基团之间的Diels-Alder（DA）反应后，交联的环氧基域与TPU基质相分离，形成微尺度域。与原始TPU和不含BMI的TPU /环氧共混物相比，TPU的弹性模量和拉伸强度大大提高。相分离的畴使自我修复变差，而相分离的微畴的存在有利于形状固定，但破坏了形状恢复。这项工作不仅有助于进一步了解具有智能特征的聚合物共混物的结构之间的关系，而且还为以经济高效的方式调整TPU的性能和功能提供了有用的方法。