关键词: 氧化石墨烯, 聚甲基丙烯酸甲酯, 自组装, 负压成膜, 耐水性能

Abstract: Graphene oxide (GO) films have excellent selective permeability, but their low preparation efficiency and poor water resistance seriously affect their development and application. In order to improve the water resistance of GO films, a rapid preparation method of self-supporting hydrophobic polymer (PMMA)/GO composite films was proposed. Hydrophobic PMMA and hydrophilic GO were dispersed together by adjusting the proportion of ternary solvent (acetone-ethanol-water), and the dispersion mechanism was explained. In this method, the self-supporting composite film is formed rapidly by self-assembly at the gas-liquid interface by means of a volatile solvent system and a negative pressure assisted film forming method, and the shortest film forming time is only 6 s. The FTIR, XRD and SEM results of the composite films show that PMMA and GO are successfully combined and a dense lamination structure is formed. With the increase of PMMA content, the degree of interlayer regularity of the composite films first increases and then decreases. As the film-forming pressure increases, there is a corresponding decline in the film’s uniformity. The composite film exhibited a 44.39% increase in tensile strength due to the addition of PMMA and the exploitation of its structural uniqueness. The water resistance of the film is obviously enhanced, and the volume swelling rate is reduced by 98.11% compared with GO film. In this paper, a ternary solvent system is used to greatly improve the film formation property and film formation speed of GO, and the prepared composite film has good water resistance, which can greatly expand the application scenario of GO film.

Key words: GO, PMMA, self-assembly, negative pressure film formation, water resistance