Abstract
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.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51373025, 51773002 and 51921002).
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UV-Vis-NIR Light-deformable Shape-memory Polyurethane Doped with Liquid-crystal Mixture and GO towards Biomimetic Applications
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Zhang, P., Cai, F., Wang, GJ. et al. UV-Vis-NIR Light-deformable Shape-memory Polyurethane Doped with Liquid-crystal Mixture and GO towards Biomimetic Applications. Chin J Polym Sci 40, 166–174 (2022). https://doi.org/10.1007/s10118-022-2657-9
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DOI: https://doi.org/10.1007/s10118-022-2657-9