Hierarchical 3D Patterns with Dynamic Wrinkles Produced by a Photocontrolled Diels-Alder Reaction on the Surface.,Advanced Materials

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Hierarchical 3D Patterns with Dynamic Wrinkles Produced by a Photocontrolled Diels-Alder Reaction on the Surface.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-01-03 , DOI: 10.1002/adma.201906712
Tiantian Li ₁ , Kaiming Hu ₂ , Xiaodong Ma ₁ , Wenming Zhang ₂ , Jie Yin ₁ , Xuesong Jiang ₁

Affiliation

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.

中文翻译：

由表面上的光控Diels-Alder反应产生的具有动态皱纹的分层3D图案。

具有动态形态的三维（3D）可重新配置图案可按需控制表面特性，例如光学，润湿和粘合特性，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具有可逆皱纹的3D图案，其中顶层的Diels-Alder（DA）反应由可逆交联的聚合物网络组成，该网络由呋喃-含有共聚物（PSFB）和双马来酰亚胺（BMI）的聚合物可以通过BMI的光二聚作用进行空间控制。当在紫外线（UV）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，从而导致扩散的浮雕图案的产生。通过控制在不同温度下的可逆DA反应，可以在表面上的裸露和未裸露区域中依次且可逆地生成或消除正交皱纹。具有边界效应的理论模型表明，在暴露区域中的皱纹方向垂直于边界，而在未暴露区域中的皱纹平行于边界。该策略基于光控DA反应，为制造具有动态形貌的3D图案化表面提供了重要而强大的替代方法。具有边界效应的理论模型表明，在暴露区域中的皱纹方向垂直于边界，而在未暴露区域中的皱纹平行于边界。该策略基于光控DA反应，为制造具有动态形貌的3D图案化表面提供了重要而强大的替代方法。具有边界效应的理论模型表明，在暴露区域中的皱纹方向垂直于边界，而在未暴露区域中的皱纹平行于边界。该策略基于光控DA反应，为制造具有动态形貌的3D图案化表面提供了重要而强大的替代方法。

更新日期：2020-02-18

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