writer：Xiwei Xu, Songqi Ma*, Hongzhi Feng, Jianfan Qiu, Sheng Wang, Zhen Yu and Jin Zhu*
keywords：Covalent Adaptable Networks，Tandem Dynamic Bonds，dissociate transfer exchange， fast reprocessability，extrusion
source：期刊
specific source：Polymer Chemistry
Issue time：2021年

Development of covalent adaptable networks (CANs) has connected thermosets and thermoplastics and brought about various functions. However, combining high performance of thermosets and fast reprocessability of thermoplastics is still a challenge for CANs. Herein, we proposed a strategy of dissociate transfer exchange (DTE) of tandem dynamic bonds to achieve continuous reprocessability for CANs without compromising thermal and mechanical properties. Epoxy monomer with tandem imine and disulfide bonds was synthesized and cross-linked to produce CANs. The dissociation of disulfide bonds significantly increased the mobility of imine bonds in series with the breaking points, leading to the fast exchange rate and reprocessability; and the high cross-link density and rigidity of the network provided the high thermal and mechanical properties. We anticipate that this strategy can efficiently accelerate various functions such as shape-shifting and self-healing as well as reprocessing and welding, and should be universally applied to other tandem dynamic systems.

论文链接：https://pubs.rsc.org/en/content/articlelanding/2021/py/d1py01045j ADDIN