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Shanghai Jiaotong University's Yin Jie-Jiang Xuesong's group "Adv. Mater.": New Progress in the Orderly Dynamic Control of Polymer Surface Folds
2020-01-08 Source: China Polymer Network

Recently, a well-known journal in the field of materials, "Advanced Materials", published the latest research progress on the micro-nano patterns of polymer surfaces by the Inje-Jiang Xuesong group of the School of Chemistry and Chemical Engineering of Shanghai Jiaotong University. Alder reaction on the surface. " Li Tiantian , a PhD student in the School of Chemistry and Chemical Engineering of Shanghai Jiaotong University, is the first author of the paper, and Researcher Jiang Xuesong is the corresponding author of the work.

Surface wrinkles are common patterns on the surfaces of natural organisms and soft materials, and are caused by stress instability. Compared with various methods for preparing micro-nano patterns, such as photolithography, nano-imprinting, and electron beam etching, the construction of micro-nano patterns on the surface of materials through wrinkling is very simple, fast, and low-cost. It shows its unique application advantages in the aspects of material physical characterization, micro-nano manufacturing, smart surface and flexible device construction. However, the spontaneous formation of wrinkles is usually disordered. The disorder of the morphology of the folds restricts the development of folds as a patterning technology. How to prepare ordered oriented folds and dynamically control them is a difficult point in this field.

Based on the study of dynamic surface fold patterns, a hard film soft base system was constructed with a reversible cross-linked polymer network and an elastomeric polydimethylsiloxane PDMS. The strategy of gathering space to regulate the DA response was used to prepare a dynamic 3D orthogonal orientation fold pattern. The photodimerization of maleimide can not only achieve spatially regulated DA reaction, but also cause the reaction to induce surface diffusion to form a grating pattern. Further, the temperature-controlled reversible DA reaction can be used to regulate the modulus of the surface layer, so that the surface fold pattern has an orientation and 3D Programmable dynamic control and other characteristics. In order to deeply study the formation mechanism of orthogonally oriented folds, the team worked with the team of Professor Zhang Wenming of Shanghai Jiaotong University to conduct a theoretical calculation and simulation of the stress change of the film by using finite element analysis to reveal the two-dimensional distribution of surface modulus. And the direction of stress release is the key to achieve orderly oriented folds. The dynamic 3D orthogonally oriented wrinkle pattern obtained by this method not only deepens the understanding of the formation of surface wrinkles, but also provides a new way to prepare dynamic micro-nano structures on the surface. It has certain applications in controllable surface adhesion, wettability, and optics. prospect.

The research was funded by a major project of basic research in Shanghai and the National Natural Science Foundation of China. We also thank Dr. Kaiming Hu and Professor Zhang Wenming of Shanghai Jiaotong University for their work in the calculation and simulation of finite element mechanics.

Paper link: http://onlinelibrary.wiley.com/doi/10.1002/adma.201906712

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