Bismaleimide (BMI) resins are high-performance thermosets that are primarily used in aerospace because of their exceptional heat resistance and physical properties. However, their growing demand has led to significant environmentally unfriendly waste. To address this, our research proposes a reprocessable BMI system using a newly synthesized BMI vitrimer (BMIV) with functional groups that form covalent adaptable networks (CANs). To enhance the properties, a symmetrical BMI with two ester groups introduced into the rigid rod molecule was designed as a CAN component. After confirming the structure using various spectroscopic techniques, BMIV was coupled with aromatic diamines via an additional aza-Michael reaction to obtain the cured resins. Subsequently, the mechanical properties and reprocessing behavior of the thermally stable and optimized thermosetting material with the best performance were evaluated, and the evidence, mechanism, and activation energy of the topology rearrangement are reported in detail.

中文翻译：

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可再加工双马来酰亚胺热固性材料的设计和评估：增强功能和可持续性兼容性


双马来酰亚胺 （BMI） 树脂是高性能热固性材料，由于其出色的耐热性和物理特性，主要用于航空航天。然而，它们不断增长的需求导致了大量对环境不友好的浪费。为了解决这个问题，我们的研究提出了一种可再加工的 BMI 系统，该系统使用新合成的 BMI vitrimer （BMIV） 及其形成共价适应性网络 （CAN） 的官能团。为了增强性能，将具有两个酯基的对称 BMI 引入刚性棒分子中设计为 CAN 组分。在使用各种光谱技术确认结构后，通过额外的 aza-Michael 反应将 BMIV 与芳香族二胺偶联以获得固化树脂。随后，评价了性能最佳的热稳定和优化热固性材料的力学性能和再加工行为，并详细报道了拓扑重排的证据、机理和活化能。