Enhanced interaction in the polyimide/sepiolite hybrid films via acid activating and polydopamine coating of sepiolite

Abstract

We aimed at enhancing interaction in the polyimide/sepiolite hybrid films with the loading of sepiolite in the polyimide matrix ranged from 0 to 8 wt% via acid activating and polydopamine doping. First, sepiolite was treated with a 3M HCl solution under reflux conditions. Then the acid-activated sepiolite was coated by mussel-inspired polydopamine under alkaline conditions.The coated polydopamine was found to successfully enhance dispersibility of sepiolite in the polyimide matrix. The modification of the sepiolite in the hybrid films was investigated by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, field emission scanning electron microscopy, thermogravimetric analysis, and transmission electron microscope. The results indicated that polydopamine coating could increase interaction between the polyimide matrix and sepiolite. KEYWORDS acid activation, polydopamine, polymer/clay nanocomposite, pyromellitic dianhydride-4,4′oxydianiline polyimide, sepiolite

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