Xiangqiang Pan Abstract

Dynamic polymer networks possess unique properties as a result of their internal dynamic bonds, such as self-healing and reprocessing abilities. In this meeting, we will primarily present some of the latest research achievements from our research group, including thermally responsive C−Se dynamic covalent chemistry (DCC). This chemistry is based on the transalkylation exchange between selenonium salts and selenides, which exhibits rapid transalkylation reactions without the need for any catalysts. Additionally, we provide evidence for the existence of a dissociative mechanism in the absence of selenide groups. Upon incorporation of this DCC into polymer materials containing selenide moieties, it was found that the cross-linked networks exhibit variable dynamic exchange rates depending on the type of alkylation reagent used. This indicates that the reprocessing capability of selenide-containing materials can be modulated. Also, by incorporating selenonium salts into polymer materials, we observed that the materials exhibited good healing ability at elevated temperatures as well as excellent solvent resistance at ambient temperature. This novel dynamic covalent chemistry thus provides a straightforward method for the healing and reprocessing of selenide-containing materials.