The Polymer Society of Korea

Abstract

The mechanical properties of network polymers, such as elastomers and gels, depend on their intrinsic polymer network topology, which is challenging to modify. To achieve on-demand control of their mechanical properties, we synthesized dynamic covalent crosslinkers that undergo photo-metathesis for reversible and gradual topological reconfiguration. The polymer network includes consistent main chains and crosslinkers that break under ultraviolet light and reform under visible light. This reconfiguration enables changes in the strength and stretchability of network polymers while maintaining their toughness and elasticity. These photo-tunable crosslinkers allow the creation of various photo-tunable elastomers and gels by integrating them with different polymer networks. Furthermore, light-induced network modulation facilitates localized mechanical property adjustments, generating transformable multi-material structures and enhancing fracture resistance.