UV-Vis-NIR Light-deformable Shape-memory Polyurethane Doped with Liquid-crystal Mixture and GO towards Biomimetic Applications  

作　　者：Peng Zhang Feng Cai Guo-Jie Wang Hai-Feng Yu 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]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

出　　处：《Chinese Journal of Polymer Science》2022年第2期166-174,共9页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51373025,51773002 and 51921002)。

摘　　要：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 NIR 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.

关 键 词：UV-Vis-NIR Light-deformable SHAPE-MEMORY LIQUID-CRYSTAL Biomimetic functional device 

分 类 号：O753.2[理学—晶体学] TQ317[化学工程—高聚物工业]