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Carbon Fiber-Reinforced Dynamic Covalent Polymer Networks Containing Acylsemicarbazide Bonds: Toward High-Performance Composites with Excellent Self-Healing and Upcycling Performance
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-08-15 , DOI: 10.1021/acssuschemeng.3c01857 Yindong Wang 1 , Wenbo Ma 1 , Zhiwen Jian 1 , Xiaokang Zhang 1 , Xi Yang 1 , Xili Lu 1 , Zhanhua Wang 1 , Hesheng Xia 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-08-15 , DOI: 10.1021/acssuschemeng.3c01857 Yindong Wang 1 , Wenbo Ma 1 , Zhiwen Jian 1 , Xiaokang Zhang 1 , Xi Yang 1 , Xili Lu 1 , Zhanhua Wang 1 , Hesheng Xia 1
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Dynamic covalent polymer networks (DCPNs) with self-healing and recycling performance are highly relevant to sustainable development. Disposal of plastic wastes generated during DCPN reprocessing still faces serious challenges and deserves to be explored. Herein, high-performance polyacylsemicarbazide (PASC) with DCPNs exhibiting excellent self-healing and recycling properties are synthesized by the reaction of sebacic dihydrazide with isophorone diisocyanate and hexamethylene diisocyanate trimer. Upcycling of the PASC waste generated after four-time reprocessing is achieved by adding epoxy monomers and amine curing reagents, followed by a thermal treatment. The optimized epoxy resin exhibits a tensile strength of 101 MPa, Young’s modulus of 2.73 GPa, elongation at break of 8.67%, toughness of 7.13 MJ·m–3, Tg of 140 °C, and Td of 250 °C, which overall surpass those of the original DCPNs, demonstrating excellent upcycling performance. The recycled resin waste from the carbon fiber-reinforced DCPNs can be upcycled using the same strategy. The upcycled epoxy resin and recycled fiber can be re-employed to prepare high-performance composites with robust mechanical properties. Given the low cost and commercial availability of the monomers, successful upcycling of PASC wastes not only reduces environmental pollution, but also enables possible industrialization and contributes to the circular economy.
中文翻译：
含有酰基氨基脲键的碳纤维增强动态共价聚合物网络：实现具有优异自修复和升级回收性能的高性能复合材料
具有自修复和回收性能的动态共价聚合物网络（DCPN）与可持续发展高度相关。DCPN再加工过程中产生的塑料废物的处置仍面临严峻挑战，值得探索。在此，通过癸二酸二酰肼与异佛尔酮二异氰酸酯和六亚甲基二异氰酸酯三聚体的反应合成了具有DCPNs的高性能聚酰氨基脲（PASC），其具有优异的自修复和回收性能。通过添加环氧单体和胺固化剂，然后进行热处理，实现了四次再处理后产生的 PASC 废物的升级循环。优化后的环氧树脂的拉伸强度为101 MPa，杨氏模量为2.73 GPa，断裂伸长率为8.67%，韧性为7.13 MJ·m –3，T g为140 °C，T d为250 °C，总体超过原DCPN，表现出优异的升级回收性能。来自碳纤维增强 DCPN 的回收树脂废料可以使用相同的策略进行升级回收。升级回收的环氧树脂和回收纤维可以重新用于制备具有强大机械性能的高性能复合材料。鉴于单体的低成本和商业可用性，PASC废物的成功升级回收不仅可以减少环境污染，而且可以实现工业化并为循环经济做出贡献。
更新日期：2023-08-15
中文翻译：
含有酰基氨基脲键的碳纤维增强动态共价聚合物网络：实现具有优异自修复和升级回收性能的高性能复合材料
具有自修复和回收性能的动态共价聚合物网络（DCPN）与可持续发展高度相关。DCPN再加工过程中产生的塑料废物的处置仍面临严峻挑战，值得探索。在此，通过癸二酸二酰肼与异佛尔酮二异氰酸酯和六亚甲基二异氰酸酯三聚体的反应合成了具有DCPNs的高性能聚酰氨基脲（PASC），其具有优异的自修复和回收性能。通过添加环氧单体和胺固化剂，然后进行热处理，实现了四次再处理后产生的 PASC 废物的升级循环。优化后的环氧树脂的拉伸强度为101 MPa，杨氏模量为2.73 GPa，断裂伸长率为8.67%，韧性为7.13 MJ·m –3，T g为140 °C，T d为250 °C，总体超过原DCPN，表现出优异的升级回收性能。来自碳纤维增强 DCPN 的回收树脂废料可以使用相同的策略进行升级回收。升级回收的环氧树脂和回收纤维可以重新用于制备具有强大机械性能的高性能复合材料。鉴于单体的低成本和商业可用性，PASC废物的成功升级回收不仅可以减少环境污染，而且可以实现工业化并为循环经济做出贡献。
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