High-Performance and Degradable Polybenzoxazine/VU Vitrimer and Its Application for Carbon Fiber Recycling
writer：Zihe Qiao,Meichen Wang,Jin Jiang, Huihui Liu, Mengyao Wang, Wenli Zhao, and Zhi Wang
keywords：degradable, recycling carbon ?ber, polybenzoxazine, toughness, and thermal properties, vitrimer
source：期刊
specific source：ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Issue time：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.