NIR‐Encoded Shape Recovery and Regulated Reversible Stress of Shape Memory Polymer

Near‐infrared (NIR) light responsive shape memory polymers (SMPs) can realize remotely and regionally controlled shape changing that shows broad potential applications. Herein, an NIR‐responsive shape memory polymer (G/PNs) is prepared by introducing reduced graphene oxide to liquid crystal elastomers‐based polymer networks (PNs). The G/PNs present regulated reversible stress by tuning the NIR light irradiation. Furthermore, since the G/PNs are 3D‐printed with designed structure, the deformed 3D printing structure can be regionally patterned with varied shapes by controlling the moving path of NIR laser. In addition, the stress relaxation and cyclic stress–strain measurements are further studied to reveal the energy loss during the deformation and shape memory cycles. In compare with the previous work, the SMP networks provide a rather high reversible actuation stress and can realize remotely control by NIR. The NIR‐encoded shape memory effect can be used as actuators, artificial muscles. An NIR‐induced shape memory polymer network is prepared by introducing reduced graphene oxide into the polymer network matrix. It combines the advantages of liquid crystal polyurethane and liquid crystal polyacrylates, and has excellent mechanical properties and shape memory properties. The deformation path of the printed structure can be regulated by controlling the moving path of the NIR laser.