作者：Zihe Qiao,Meichen Wang,Jin Jiang, Huihui Liu, Mengyao Wang, Wenli Zhao, and Zhi Wang
关键字：degradable, recycling carbon ?ber, polybenzoxazine, toughness, and thermal properties, vitrimer
论文来源：期刊
具体来源：ACS SUSTAINABLE CHEMISTRY & ENGINEERING
发表时间：2022年

Carbon ?ber (CF)-reinforced thermoset resin matrix composites are widely used in aerospace, national defense, and military due to their outstanding mechanical and thermal properties. The recycling of CFs has social and economic bene?ts. After curing, the thermoset resin has a three-dimensional cross-linked network structure, making it challenging to balance its mechanical and

thermal properties with the degradation and recycling e?ciency. The severe recycling conditions can damage CFs. In this study, a new resin system is designed and prepared based on vinylogous

urethane vitrimers (VUvs) containing dynamic bonds and bisphenol A-aniline-based benzoxazine (BA-a) with improved mechanical (impact strength up to 16.9 kJ/m2) and thermal properties (higher than 300 °C for Td5) that can be degraded under mild conditions (70 °C, 4 h). Moreover, the mono?lament tensile strength of the recovered CF of BA-a/VUv CF-reinforced composites was identical to that of the original CF. Thus, this robust and degradable material system is ideal for the high performance of CF composites and for recycling valuable CFs.