【摘 要】
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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 advanta
【机 构】
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School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100
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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.
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