4D printing of shape memory polyurethane via stereolithography

In our research, a type of polyurethane acrylate is successfully synthesized and then compounded with epoxy acrylate and isobornyl acrylate as well as radical photoinitiator to get photopolymer. Afterwards, the photopolymer is applied through stereolithography 3D printing to fabricate shape memory polymers. The photopolymer is proved to have high UV-curing activity and the printing accuracy is high. Fold-deploy test and shape memory cycles...