Multifunctional Shape Memory Polyurethane Light Response Actuator

Smart materials are new generation of functional materials that can perceive external stimuli,can determine and process them,and can perform corresponding exercises based on external stimuli.As one of the smart materials,the development of flexible actuators had promoted the advancement of intelligent theory to reality,and were expected to be applied in fields such as software robots,smart medical equipment,and smart wearable devices.At present,flexible actuators that respond to different stimuli have been received a lot of research.However,most application scenarios also require the flexible actuators to develop the characteristics of miniature,remote controllable,multi-function,and feedback of drive progress.In this paper,polymer composites(TSMP)with triple shape memory effect(TSME)is obtained by blending shape memory polyurethane(SMPU)and high molecular weight polycaprolactone(PCL)in a solvent,and porous membranes are obtained by electrospinning,and then CNT/Ti₃C₂Tx conductive network structures are constructed by vacuum filtration fabricated photo-responsive actuators with TSME.The conductive network formed by CNT/Ti₃C₂Tx on the TSMP film may simultaneously comply with the tunneling and cracking theories,so that the MCTSMP-50 actuator has R_rof 42.64 and 58.03 at a pre-programmed strain condition of 30%.The remote NIR controls MCTSMP-50 to complete a series of actions.That indicated that the TSME light-responsive actuator is expected to broaden the development of soft robots.Moreover,a porous membrane was obtained by electrospinning shape memory polyurethane(SMPU),followed by in-situ polymerization of dopamine to modify the SMPU membrane,vacuum filtration of CNT/Ti₃C₂Tx and vapor deposition of1H,1H,2H,2H-perfluorodecyltrichlorosilane is prepared to obtain waterproof light-responsive shape memory actuators.Since the formed fluorinated layer is thin enough and the fluorinated layer can withstand certain external scratches,the sample has good hydrophobic effect,electrical properties,and photothermal properties.The results shows that the water contact angle(WAC)of the F-MPDA@SMPU composites reaches 151.1°,and the resistance of the material with the fluorinated layer only rises to 2.8 times the original resistance,and the saturation temperature can be reached 76.4? as soon as 7.4 s under NIR stimulation.In terms of self-sensing,F-MCPDA@SMPU has a maximum R_rof 945.8 at40%pre-programmed strain.By simulating the actuated process in the dry and wet state,F-MCPDA@SMPU was pulled down by NIR to raise the 6.5 g dovetail clip,doing 3.9*10^-4J work,while maintaining the stability of the sensor signal.That indicate that the waterproof light-responsive shape memory actuator can work in a humid environment,and is expected to broaden and broaden soft robots and artificial muscles in more application scenarios.