Thermally Responsive Selenide-containing Materials Based on Transalkylation of Selenonium Salts
Sisi Chen,1 Vincent Scholiers,2 Mengyao Zhang,1 Jiandong Zhang,1 Jian Zhu,1,* Filip E. Du Prez,2,* and Xiangqiang Pan1,*
1 State and Local Joint Engineering Laboratory for Novel Functional Department Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 (China)
2 Polymer Chemistry Research group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University Krijgslaan 281, S4-bis, 9000 Ghent (Belgium)
Angew. Chem. Int. Ed. 2023, e202309652.
Abstract: Covalent adaptable networks (CANs) possess unique properties as a result of their internal dynamic bonds, such as self-healing and reprocessing abilities. In this study, we report a thermally responsive C−Se dynamic covalent chemistry (DCC) that relies on the transalkylation exchange between selenonium salts and selenides, which undergo a fast transalkylation reaction in the absence of any catalyst. Additionally, we demonstrate the presence of a dissociative mechanism in the absence of selenide groups. After incorporation of this DCC into selenide-containing polymer materials, it was observed that the cross-linked networks display varying dynamic exchange rates when using different alkylation reagents, suggesting that the reprocessing capacity of selenide-containing materials can be regulated. 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.
链接：//onlinelibrary.wiley.com/doi/abs/10.1002/anie.202309652
