Shape Memory Polymer Surface with Tunable Microstructure and Adhesion†

doi:10.7503/cjcu20160181

Abstract

Abstract:

A low adhesive superhydrophobic surface with shape memory microstructures was prepared by the template method. It was found that under the external pressure, the surface would lose the superhydrophobicity for the destroyed microstructures, and meanwhile, the surface became high adhesive. After heating the surface at 120 ℃, both surface microstructures and the low adhesive superhydrophobicity can be recovered. The results indicate that the adhesive property can be controlled reversibly by controlling the surface microstructures. Different microstructures results in different wetting states, as a result, the surface shows different adhsions. On the original surface, water droplet resides in the low adhesive Cassie state, while on the crushed surface, the droplet resides in the high adhesive Wenzel state.

Key words: Shape memory polymer, Surface microstructure, Wettability, Adhesion

TrendMD:

LÜ Tong, CHENG Zhongjun, LAI Hua, ZHANG Enshuang, LIU Yuyan. Shape Memory Polymer Surface with Tunable Microstructure and Adhesion^†[J]. Chem. J. Chinese Universities, 2016, 37(7): 1351.

Figures/Tables 5

Fig.1 SEM images of Ni template with different magnifications

Fig.2 SEM images of surface of the as-prepared template(A, B), the surface after pressing(C) and heating(D) treatment (B) magnification of (A).

Fig.3 Confocal microscopy images of surfaces at different state(A) Original state; (B) crushed state after pressing; (C) restored state after heating; (D—F) the profile pictures corresponding to (A)—(C), respectively.

Fig.4 Shapes of a water droplet on the surface at different states(A) The original state; (A') a water droplet can roll on the original surface with a sliding angle of about 9°; (B) the curshed state after pressing; (B') a water droplet is pinned on the surface with crushed microstructure; (C) the restored state after heating; (C') a water droplet can roll again on the restored surface with a sliding angle of about 10°.

Fig.5 Force-distance curves for surface at different states(A—C) and force-cycle number relation after pressing and heating(D)(A) The original state; (B) the crushed state after pressing; (C) restored state after heating; (D) the adhesive force between the surface and a water droplet can be changed by reversibly as the surface microstructures changed alternately.

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