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          SJTU Research Team Made Progress on Constructing Patterned Polymer Surfaces

          January 07, 2020      Author:

          Recently, the research team of Yin Jie and Jiang Xuesong from the School of Chemistry and Chemical Engineering published the paper Hierarchical 3D patterns with dynamic wrinkles produced by a photocontrolled Diels-Alder reaction on the surface on Advanced Materials. Doctoral student Li Tiantian was the first author of the paper, and researcher Jiang Xuesong the corresponding author.

          The research found the dynamic 3D orthogonal oriented fold patterns which made deeper understanding of the formation of surface folds and offered a new way for the preparation of surface dynamic micro-nano structures. It can be applied in controlled surface adhesion, infiltration and optics.

          The research was supported by the Shanghai key fundamental research project and National Natural Science Foundation of China. Prof. Zhang Wenming and Doctor Hu Kaiming from the School of Mechanical and Engineering also contributed in the research in terms of finite element mechanical calculation and simulation.

           

          Abstract

          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.

          Paper Link:https://onlinelibrary.wiley.com/doi/10.1002/adma.201906712

           

          Translated by Huang Yiqing     Reviewed by Wang Bingyu

           
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