Multi-Functional Curvilinear Shape-Morphing with Patterned Adhesive Tapes via Localized Photothermal Effects

초록

Construction of a 3D structure from 2D flat geometry has received great attention in the materials community. Although various methods are reported to achieve 2D to 3D shape-morphing, photothermal actuation has been emerged as a promising method for contactless shape-reconfiguration. The photothermal heating method often use black inks on the shape memory polymers to localize photothermal heating. However, this method could cause further undesirable actuation as the ink patterns remain even after creating the desirable 3D structures. In this study, adhesive tape patterns were employed instead of the ink patterns in order to achieve transparent 3D structures as well as prevent undesirable actuations. When black adhesive tapes were irradiated with NIR light, the patterned areas absorb photons and generate photothermal heating. When the temperature exceeds the polymer glass transition temperature, shrinkage of polymer occurs by recovery of random coil conformation from biaxially pre-strained coils. We discuss the effects of various radial and chiral tape patterns on curvature control for complex 3D structures. Furthermore, we will demonstrate sequential folding by temporal regulation of the NIR irradiation. We will also discuss shape-reconfiguration of heterogeneous materials with the addition of compliable papers and introduction of conductive functions on 3D morphed polymers.