A Versatile Approach for Preparing Shape‐Morphing Bilayer Films by Simply Adhering Two SEBS/Paraffin Films with Different Deformability and Melting Temperatures

Abstract

Shape‐morphing materials that can exhibit various shape deformations are highly desirable. In this work, shape‐morphing materials with diverse deformation modes are prepared via a facile approach of constructing bilayer structures of SEBS/paraffin blends with different melting temperatures. The bilayer films are prepared using a simple solvent‐coating adhesion method, either by adhering two single‐layers together and stretching or by adhering two pre‐stretched single‐layers. These bilayer films show strong interfacial adhesion due to the similar chemical composition of the two layers. By adjusting the programming method, stretching strain, and thickness ratio, the shape deformation behaviors of the resultant bilayer films can be flexibly tuned. To demonstrate the wide applicability of this approach, several 2D sheets with hinge structures as well as a smart dressing are prepared, in which the former can be transformed into 3D configurations and the latter can automatically fit to the human body and peel off. Owing to the advantages of low cost, easy and large‐scale preparation, recyclability, and high designability, the approach for preparing shape‐morphing bilayer films proposed by this work is versatile and the obtained bilayer films have the potential to satisfy the demands of divergent application fields.

Flexible, antibacterial porous phase change thermal management film prepared by a one-step extrusion casting-foaming method

“…The SEBS/paraffin system, which contained a crystallizable fixing phase (paraffin) and an elastic recovering phase (SEBS), was a kind of interesting shape memory material. [29][30][31][32][33] Utilizing the shape memory properties of the material, it could be used as a wearable device that could be firmly attached to various parts of the human body. Here, the shape memory properties of the SPWTPP phase change foaming film were tested, and the results are shown in Fig.…”

Mechano‐Activated Shape Morphing of Aluminum–Plastic Laminate Composites

“…Beyond our fundamental interest in plasticity effects in layered systems, [5][6][7][8] we are motivated by the potential for origami engineering where shape morphing can be induced in metal-plastic laminates by a simple loading-unloading protocol. Indeed such a stretch-release approach to origami has been explored previously, [1,3,4,[9][10][11] and Nelson et al [3,4] have coined the DOI: 10.1002/adem.202301111…”

“…Tang et al [9] showed especially beautiful examples of complex shapes realized by this approach. The permanent deformations in the past research were attributable to various mechanisms: plasticity of semicrystalline polymers [5,12] or of paraffin waxes, [11] plasticity of a crystallizable wax used as swelling agent, [9] or charge interactions in a polymer network. [3,4] In contrast, this article exploits the plasticity of metals beyond their yield point.…”