Soft materials containing dynamic C–N bonds for fluorescence visualization

Abstract Dynamic covalent bonds exhibit excellent reversibility, high sensitivity and flexible designability among all dynamic covalent bonds. Herein, a dynamically covalent cross-linked polymer (CPPHEA) with triazolinedione (TAD)-indole adducts as cross-linking points was constructed, and the CPPHEA˗6 % exhibits good mechanical properties (51 MPa). In addition, the in-situ relaxation fluorescence spectroscopy was used to characterize the dynamic behavior of C–N bonds in force-reversible polymer networks. Overall, our strategy provides a strong basis for the development of covalent crosslinked polymer materials while enhancing mechanical strength and ductility, which is difficult to achieve with conventional chemical approaches.