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首页> 外文期刊>Macromolecular Research >New Chain-Extended Bismaleimides with Aryl-Ether-Imide and Phthalide Cardo Skeleton (II): Creep, Stress Relaxation, Shape Memory and Self-Repairing Properties
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New Chain-Extended Bismaleimides with Aryl-Ether-Imide and Phthalide Cardo Skeleton (II): Creep, Stress Relaxation, Shape Memory and Self-Repairing Properties

机译：具有芳基醚 - 酰亚胺和酞菁的新的链扩展的双聚酰氨酰骨架（II）：蠕变，应力松弛，形状记忆和自修复性能

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摘要

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 degrees 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.
机译：在本文的第一部分中，我们专注于含有芳基醚 - 酰亚胺和具有不同分子量（MPEIBMI-2.0，MPEIBMI-1.5和MPEIBMI-1.25）的三个链延伸的双聚烯烃的合成，表征和溶解性。以及其固化树脂的热稳定性和热力学性能。在本文的第二部分中，通过动态机械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）性能和微损害的自修复行为。由于其网络结构的最高刚度，蠕变测试结果表明MPeibmi-2.0固化膜具有最强的蠕变电阻，并且200摄氏度的MPeibmi-1.25膜的最大允许载荷达到60 MPa最小蠕变实验。尽管具有相对较低的应力水平，MPeibmi-1.25膜的应力松弛率较慢。 MPEIBMI-1.25膜在高温下具有最大的极限伸长率，并且这种可变形性赋予优异的形状记忆（SM）能力。形状固定率达到98％以上，回收率在一个SM循环后从94.5％增加到94.5％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，并且通过其交联密度增加修复温度以获得完美的修复效率。

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