Intrinsically Luminescent, Reprogrammable, and Chemically Recyclable Liquid Crystal Elastomers Enabled by Dynamic Vinylogous Urethane Chemistry

. Thanks to the catalyst-free transamination of VU bonds, the VULCE enables reprogramming into diverse three dimensional (3D) actuators with reversible actuation at 110°C for 10 min. Furthermore, the VULCE network can be depolymerized into LC oligomers and small molecules in an organic solvent under excess bifunctional amines at 80°C for 6 h. The recycled solution can be repolymerized into new VULCE with arbitrary shapes by reintroducing chain extenders, mesogenic monomers, and crosslinkers, achieving polymer-oligomer/small molecule-polymer recycling. More importantly, the VULCE emits intrinsic blue fluorescence owing to the clustering-triggered emission (CTE) effect. This work demonstrates unprecedented multifunctionality, providing new insights for the development of multifunctional integrated LCE materials.