76.(JMCA) Dihydrazone-based Dynamic Covalent Epoxy Networks with High Creep Resistance, Command Degradability, and Intrinsic Antibacteria from Bioresources
writer：Xiwei Xu, Songqi Ma,* Sheng Wang,Jiahui Wu, Qiong Li, Na Lu, Yanlin liu, Jintao Yang, Jie Feng, Jin
keywords：熱固性樹脂，環(huán)氧樹脂，可逆共價(jià)交聯(lián)網(wǎng)絡(luò)，回收，本征抗菌，生物基，高溫抗蠕變
source：期刊
specific source：Journal of Materials Chemistry A
Issue time：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.
論文鏈接： https://pubs.rsc.org/en/content/articlepdf/2020/TA/D0TA01419B?page=search