Preparation method for polypyrrole-poly-dopamine composite coating

Abstract

The invention discloses a preparation method for a polypyrrole-poly-dopamine composite coating. The preparation method includes the following steps that (1) dopamine and a dopant are dissolved into deionized water, then a pyrrole monomer without impurities is continuously added to be dissolved, dry nitrogen is then led in to remove dissolved oxygen in a mixture, and an electrolyte with the pH ranging from 1 to 8 is obtained; and (2) in the above electrolyte, a constant potential polymerization process is adopted for conducting polymerization on the surface of one side of a pure titanium substrate to obtain the polypyrrole-poly-dopamine composite coating, and oxide, miscellaneous dirt and grease on the surface of the pure titanium substrate are removed through pretreatment. According to the method, an electrochemical method is adopted for conducting polymerization on the dopamine and the pyrrole, the polymerization time is short, polymerization can be carried out under the acidity and alkaline conditions, and meanwhile a polymerization film obtained through polymerization has some beneficial effects of the dopamine and the pyrrole; and a larger possibility is provided for potential application of the polymerization film.

Description

technical field [0001] The invention specifically relates to a preparation method of a polypyrrole-polydopamine composite coating. Background technique [0002] For a long time, polymer materials have been regarded as insulating materials and structural materials, until 1974 when scientists discovered that AsF 5 or I 2 After doping, polyacetylene exhibits unique properties such as light, electricity, magnetism and thermal electromotive force, and its conductivity is also changed from 10 -9 S / cm up to 10 -3 S / cm, reaching the level of metal conductors (C.K.Chiang, M.A.Druy, S.C.Gau, A.J.Heeger, E.J.Louis, A.G.MacDiarmid, Y.W.Park, and H.Shirakawa. Synthesis of highlyconducting films of derivatives of polyacetylene, (CH)x[ J]. Journal of the American Chemical Society. 1978, 100(3): 1013-1015). Since then, the self-contained interdisciplinary research field of conductive polymers has rapidly become a worldwide research hotspot. As a typical conductive polymer material, pol...

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Problems solved by technology

However, it is difficult to obtain a film with a certain thickness in a short period of time, whether it is based on the self-polymerization or electrochemical polymerization of dopamine under alkaline aerobic conditions.

And there are reports in the literature that the self-polymerization of dopamine under alkaline aerobic conditions can hardly exceed 50nm in thickness, and it will self-polymerize to form nanoparticles in the solution while polymerizing on the substrate Dopamine is not polymerized on the base, so its film-forming utilization rate is not high

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