Hierarchical 3D Patterns with Dynamic Wrinkles Produced by a Photocontrolled Diels-Alder Reaction on the Surface
Hierarchical 3D Patterns with Dynamic Wrinkles Produced by a Photocontrolled Diels-Alder Reaction on the Surface
复制标题
表面光控 Diels-Alder 反应产生的具有动态皱纹的分层 3D 图案
DOI：
10.1002/adma.201906712
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发表时间：
2020-01-03
影响因子：
29.4
通讯作者：
Jiang, Xuesong
中科院分区：
文献类型：
--
作者：
Li, Tiantian;Hu, Kaiming;Jiang, Xuesong
具有动态形态的三维（3D）可重构图案使得能够按需控制表面特性，诸如光学、润湿和粘附特性，以实现智能表面。在这里，开发了一种简单而通用的策略来制造表面上具有可逆皱纹的3D图案，其中顶层中的Diels-Alder（D-A）反应可以通过BMI的光二聚来空间控制，所述顶层由含呋喃共聚物（PSFB）和双马来酰亚胺（BMI）组成的可逆交联聚合物网络组成。当在用紫外（UV）光照射期间使用光掩模时，马来酰亚胺的选择性光二聚化导致马来酰亚胺从未曝光区域扩散到曝光区域，导致产生扩散的浮雕图案。通过在不同温度下控制可逆D-A反应，可以在表面上的暴露区域和未暴露区域中顺序地且可逆地产生或消除正交皱纹。边界效应的理论模型表明，在曝光区域的皱纹的方向是垂直于边界，而在未曝光区域的皱纹是平行于边界。这种基于光控D-A反应的策略为制造具有动态形貌的3D图案化表面提供了重要且稳健的替代方案。
Three-dimensional (3D) reconfigurable patterns with dynamic morphologies enable the on-demand control of surface properties, such as optical, wetting, and adhesive properties, to achieve smart surfaces. Here, a simple yet general strategy is developed for fabricating 3D patterns with reversible wrinkles on the surface, in which a Diels-Alder (D-A) reaction in the top layer, which consists of a reversible cross-linked polymer network composed of a furan-containing copolymer (PSFB) and bismaleimide (BMI), can be spatially controlled by the photodimerization of BMI. When a photomask is used during irradiation with ultraviolet (UV) light, selective photodimerization of the maleimide leads to the diffusion of maleimide from the unexposed region to the exposed region, resulting in the generation of a diffused relief pattern. By controlling the reversible D-A reaction at different temperatures, orthogonal wrinkles can be sequentially and reversibly generated or erased in both the exposed and unexposed regions on the surface. Theoretical modeling with boundary effects reveals that the orientation of the wrinkle in the exposed region is perpendicular to the boundary, whereas the wrinkle in the unexposed region is parallel to the boundary. This strategy, based on a photocontrolled D-A reaction, provides an important and robust alternative for fabricating 3D patterned surfaces with dynamic topographies.