Research Progresses in Methods for Improving the Properties of Dynamic Covalent Polymer Networks

Dynamic covalent polymer networks (DCPNs) are a class of cross-linked polymeric materials with good self-healing properties, processability, and recyclability. These materials generally possess dynamic covalent bonds which can undergo reversible cleavage and reformation under certain conditions. The cross-linking and dynamic nature of the materials endows them with the needed mechanical strength as well as processibility, effectively bridging the gap between traditional thermosets and thermoplastics. However, in many cases, relying on dynamic covalent bonds alone cannot always achieve satisfactory material properties, so the modification of DCPNs has been one of the hot spots in this area. This review summarizes the recent research progress on the modification of DCPNs, including the introduction of multiple dynamic bonds and filler blending, and analyzes how the modifications can improve specific properties. This review provides a comprehensive overview of diverse methods to manipulate structures and properties of DCPNs, which may expand their potential applications.