Nature has been inspiring material researchers to fabricate biomimetic functional devices for various applications,and shape-memory polymer materials (SMPMs) have received tremendous attention since the promising intelligent materials possess more advantages over others for the fabrication of biomimetic functional devices.As is well-known,SMPMs can be stimulated by heat,electricity,magnetism,pH,solvent and light.From the viewpoint of practical applications,ultraviolet (UV)-visible (Vis)-near infrared (NIR) light-responsive SMPMs are undoubtedly more advantageous.However,up to now,UV-Vis-NIR light-deformable SMPMs by combining photothermal and photochemical effects are still rarely reported.Here we designed a UV-Vis-NIR light-deformable SMP composite film via incorporating a liquid crystal (LC) mixture and graphene oxide(GO) into a shape-memory polyurethane matrix.The elongated composite films exhibited interesting photomechanical bending deformations with different light-triggered mechanisms,(1) photochemically induced LC phase transition upon UV exposure,(2) photochemically and photothermally induced LC phase transition upon visible-light irradiation,(3) photothermally triggered LC phase transition and partial stress relaxation upon low-intensity NIFR exposure.All the deformed objects could recover to their original shapes by high-intensity NIR irradiation.Moreover,the biomimetic circadian rhythms of acacia leaves and the biomimetic bending/spreading of fingers were successfully achieved,which could blaze a way in the field of biomimetic functional devices due to the excellent light-deformable and shape-memory properties of the SMP composite films.

Peng Zhang;Feng Cai;Guo-Jie Wang;Hai-Feng Yu

School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Institute of New Structural Materials,School of Materials Science and Engineering,and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,Peking University,Beijing 100871,China

高分子科学（英文版）

[1]Peng Zhang;Feng Cai;Guo-Jie Wang;Hai-Feng Yu-.UV-Vis-NIR Light-deformable Shape-memory Polyurethane Doped with Liquid-crystal Mixture and GO towards Biomimetic Applications)[J].高分子科学（英文版）,2022(02):166-174

SMPMs,photochemically,photothermally,NIFR,blaze

UV,Vis,NIR,Light,deformable,Shape,memory,Polyurethane,Doped,Liquid,crystal,Mixture,towards,Biomimetic,Applications,Nature,been,inspiring,researchers,fabricate,biomimetic,functional,devices,various,applications,polymer,materials,have,received,tremendous,attention,since,promising,intelligent,possess,more,advantages,others,fabrication,well,known,can,stimulated,by,heat,electricity,magnetism,solvent,light,From,viewpoint,practical,ultraviolet,visible,near,infrared,responsive,undoubtedly,advantageous,However,combining,effects,still,rarely,reported,Here,designed,composite,via,incorporating,liquid,LC,mixture,graphene,oxide,into,polyurethane,matrix,elongated,films,exhibited,interesting,photomechanical,bending,deformations,different,triggered,mechanisms,induced,phase,transition,upon,exposure,irradiation,partial,stress,relaxation,low,intensity,All,deformed,objects,could,recover,their,original,shapes,high,Moreover,circadian,rhythms,acacia,leaves,spreading,fingers,were,successfully,achieved,which,way,field,due,excellent,properties

0.542541