作者：Xiwei Xu, Songqi Ma,* Sheng Wang,Jiahui Wu, Qiong Li, Na Lu, Yanlin liu, Jintao Yang, Jie Feng, Jin
关键字：热固性树脂，环氧树脂，可逆共价交联网络，回收，本征抗菌，生物基，高温抗蠕变
论文来源：期刊
具体来源：Journal of Materials Chemistry A
发表时间：2020年

Covalent adaptable networks (CANs) provide a promising approach to the recycle issue of thermosets due to their dynamic cross-linked networks. However, CANs are susceptible to creep at relatively low temperatures, and their chemical stability is also inevitably doubted. Here, we designed novel dihydrazone CANs from cross-linking of a dihydrazone-containing epoxy monomer which was synthesized from the condensation of lignin derivative vanillin and hydrazinium hydrate, followed by reacting with epichlorohydrin. Beside the excellent alleability and reprocessability, the dihydrazone CANs exhibited high initial creep temperature of ~105 °C, which was ascribed to the superior stability of hydrazone bond at around 100 °C and favorable hydrazine exchangeability at elevated temperatures. Meanwhile, the degradation of the dihydrazone CANs exhibited temperature, solvent and acidity dependence. Moreover, on account of the high antibacterial property of hydrazone bond, the CANs presented high killing rate (95.8%) to Gram-negative bacteria (E. coli). Thus, this work disclosed an effective dynamic covalent motif for the development of CANs with excellent dimensional stability, themical resistance and intrinsic antibacteria.

论文链接： https://pubs.rsc.org/en/content/articlepdf/2020/TA/D0TA01419B?page=search