Preparation of Bonded Super-hydrophobic Thin Film†

doi:10.7503/cjcu20180600

Abstract

Abstract:

By combining polydimethylsiloxane(PDMS) and carbon fabric, a superhydrophobic film with repeated adhesion performance was fabricated by the introduction of microarray structure on the PDMS polymer surface with a template method. The results show that the contact angle and rolling angle on the microstructural surface of the thin film are 154° and 14°, respectively, having low adhesion superhydrophobicity performance. The close combination of PDMS and carbon fiber fabric can endow the superhydrophobic film with higher adhesion performance and mechanical property. The breaking strength reaches 116.96 MPa. The as-prepared superhydrophobic film can be adhered on different materials. After long time adhesion of 30 d and repeated adhesion of 50 times, the as-prepared film still maintains high adhesion and superhydrophobic properties, which shows that the superhydrophobic film has good mechanical stability and durability and can meet the requirements of reusability for a long time. It can be used to repair the large-area damaged super-hydrophobic coating quickly and efficiently.

Key words: Adhesive superhydrophobic thin film, Surface micro-structure, Adhesion, Repair

CLC Number:

O631

TrendMD:

MA Haoxiang,LAI Hua,ZHANG Enshuang,LÜ Tong,CHENG Zhongjun,LIU Yuyan. Preparation of Bonded Super-hydrophobic Thin Film^†[J]. Chem. J. Chinese Universities, 2019, 40(3): 560.

Figures/Tables 6

Scheme 1 Preparation process of the film(A) PDMS transfer template; (B) PDMS/carbon fiber film; (C) surface microstructure of the PDMS/carbon fiber film.

Fig.1 SEM images and contact angle(CA) of the film(A) The pillar structures on the upper surface of the film; (B) magnified image of one pillar; (C) smooth structure on the lower surface of the film; (D) cross-sectional view of the film; (E) magnified image of pillar arrays; (F) magnified image of the fibers; (G, H) shapes of a water droplet standing and rolling on the surface, respectively.

Fig.2 Stress-strain curves of pure PDMS film(A) and PDMS/carbon fiber film(B)

Fig.3 Optical photos of the superhydrophobic films bonded to different substrates

Fig.4 Adhesive forces of the film(A) Adhesive force curves for the film bonding to glass substrate; (B) dependence of the adhesive forces on the preloading forces; (C) the variation of adhesive force with the preloading time; (D) statistic results about the adhesive forces of thin films bonding to different materials. a. Glass; b. stone; c. aluminum; d. wood; e. polyimide film; f. carbon fibre composite.

Fig.5 Stability of the film(A—E) Optical photos of one cyclic adhesion process for the film to the stone substrate; (F) contact angle(a) and adhesive forces(b) of the film after 50 cycles; (G) contact angles(a) and adhesive forces(b) of the film after 30 d storage.

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