3C01 Preparation of crosslinked azobenzene liquid-crystalline polymers with dynamic covalent bonds by transesterification reactions

Abstract

We prepared crosslinked azobenzene liquid-crystalline polymers (CLCPs), which contain dynamic covalent crosslinking points based on transesterification between phenyl benzoates and hydroxyl groups in the side chain. Although permanently crosslinked polymers can not be remolded, the CLCP films were remoldable through transesterification reaction when heated at 80 ℃ Upon exposure to UV light, the CLCP films with aligned mesogens by applying external force under heating bent toward a light source, and when irradiated with Vis light, the bent film reversed to the initial state.