In Part I of the paper, we have focused on the synthesis, characterization and solubility of three chain-extended bismaleimides containing aryl-ether-imide and phthalide cardo skeleton with different molecular weight (MPEIBMI-2.0, MPEIBMI-1.5 and MPEIBMI-1.25) and the thermal stability and thermal mechanical properties of their cured resins. In Part II of the paper, their high-temperature static viscoelasticity, shape memory (SM) performance and self-repairing behavior for micro-damages were investigated by dynamic mechanical analyzer and optical microscope. The creep test results exhibit the MPEIBMI-2.0 cured film has the strongest creep resistance at the same testing temperature due to the highest stiffness of its network structure, and the maximum allowable load of MPEIBMI-1.25 film at 200 °C reaches 15 MPa for 60 min creep experiment. The rate of stress relaxation for MPEIBMI-1.25 film is slower in spite of having relatively lower stress level. The MPEIBMI-1.25 film has the largest ultimate elongation at high temperature and this deformability confers it excellent shape memory (SM) ability. The shape fixity ratio reaches above 98% and the recovery rate is increased to above 96% from 94.5% after one SM cycle. The micro-damages on the surface of cured films could be repaired when heated to the temperature above their glass transition temperature, and the repairing temperature is increased with their crosslinking density to obtain perfect repairing efficiency.

中文翻译：

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具有芳基醚酰亚胺和邻苯二甲酰胺心骨架的新型链扩展双马来酰亚胺（II）：蠕变，应力松弛，形状记忆和自我修复特性

在本文的第一部分中，我们重点研究了含有不同分子量的芳基醚酰亚胺和邻苯二甲氧基骨架的三种扩链双马来酰亚胺的合成，表征和溶解性（MPEIBMI-2.0，MPEIBMI-1.5和MPEIBMI-1.25）以及其固化树脂的热稳定性和热机械性能。在本文的第二部分中，通过动态力学分析仪和光学显微镜研究了它们的高温静态粘弹性，形状记忆（SM）性能和微损伤的自修复行为。蠕变测试结果表明，MPEIBMI-2.0固化膜由于其网络结构的最高刚度而在相同的测试温度下具有最强的抗蠕变性，并且200℃下MPEIBMI-1.25膜在60°C下的最大允许载荷达到15 MPa分钟蠕变实验。尽管具有相对较低的应力水平，但MPEIBMI-1.25薄膜的应力松弛速率较慢。MPEIBMI-1.25膜在高温下具有最大的极限伸长率，这种可变形性使其具有出色的形状记忆（SM）能力。一个SM循环后，形状固定率达到98％以上，恢复率从94.5％提高到96％以上。当加热到高于其玻璃化转变温度的温度时，可以修复固化膜表面上的微损伤，并且随着交联密度的增加，修复温度会提高，从而获得完美的修复效率。25膜在高温下具有最大的极限伸长率，这种可变形性赋予它出色的形状记忆（SM）能力。一个SM循环后，形状固定率达到98％以上，恢复率从94.5％提高到96％以上。当加热到高于其玻璃化转变温度的温度时，可以修复固化膜表面上的微损伤，并且随着交联密度的增加，修复温度会提高，从而获得完美的修复效率。25膜在高温下具有最大的极限伸长率，这种可变形性赋予它出色的形状记忆（SM）能力。一个SM循环后，形状固定率达到98％以上，恢复率从94.5％提高到96％以上。当加热到高于其玻璃化转变温度的温度时，可以修复固化膜表面上的微损伤，并且随着交联密度的增加，修复温度会提高，从而获得完美的修复效率。