Abstract Fiber reinforced thermoset composites (FRPCs) have received tremendous attention because of their merits of light weight, high modulus and high strength. However, the efficient recycling of the waste during the manufacturing and service life of FRPCs is still great challenge. This paper reports a newly designed dynamic crosslinked network based on Diels-Alder chemistry as matrix for fully recyclable aramid fabric reinforced composites. The DA network shows good thermomechanical properties owing to the incorporated aromatic amide bonds, and the overall performance can be readily tailored by adjusting the ratio of amide-containing component and flexible aliphatic component. The good reversibility of the DA network and highly efficient recovery of mechanical properties of recycled sample are confirmed. With optimized composition, the DA network exhibits good interfacial strength with aramid fiber that is comparable to that of widely used epoxy resin due to the interfacial hydrogen bonds among amide bonds between fiber and matrix. Moreover, the closed-loop recycling of both matrix and reinforced fabric without any other additive is also demonstrated. This paper presents the first report on recyclable aramid fiber reinforced composites and is expected to provide hints for future development of fully recyclable and high-performance FRPCs.

中文翻译：

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基于 Diels-Alder 化学的含酰胺交联网络的设计和合成，用于完全可回收的芳纶织物增强复合材料

摘要 纤维增强热固性复合材料（FRPCs）以其轻质、高模量、高强度等优点受到广泛关注。然而，在 FRPC 的制造和使用寿命期间，废物的有效回收仍然是一个巨大的挑战。本文报告了一种新设计的动态交联网络，该网络基于 Diels-Alder 化学作为可完全回收的芳纶织物增强复合材料的基质。由于引入了芳族酰胺键，DA网络显示出良好的热机械性能，并且可以通过调整含酰胺组分和柔性脂肪族组分的比例来轻松定制整体性能。证实了 DA 网络的良好可逆性和回收样品机械性能的高效恢复。通过优化的成分，由于纤维和基体之间酰胺键之间的界面氢键，DA网络与芳纶纤维表现出良好的界面强度，可与广泛使用的环氧树脂相媲美。此外，还证明了基质和增强织物在没有任何其他添加剂的情况下的闭环回收。本文首次提出了可回收芳纶纤维增强复合材料的报告，有望为完全可回收和高性能 FRPC 的未来发展提供线索。