| Pipes and equipments made of stainless steel may suffer from bio-corrosion, which is a problem that generates huge economic losses. To keep stainless steel equipments away from bio-corrosion, it is crucial to immobilize antibacterial coatings. Therefore antibacterial surface modification materials will have great prospect applications.In this work, a base layer, which consists of polydopamine and silane coupling agents was prepared. By in situ simultaneous polymerization of dopamine and hydrolytic polycondensation of 3-aminopropyl triethoxysilane in an aqueous solution, a novel hybrid polymer network coating on stainless steel was formed. The hybrid polymer adhered strongly on the surface of stainless steel. The coating on the stainless steel substrates exhibited long term stability in seawater.3-Chloro-2-hydroxypropyltrimethyl ammonium chloride(CHPTAC) was grafted onto the hybrid polymer film in an alkaline solution. The grafted CHPTAC was effective in killing bacteria conferring the hybrid polymer coating with biocidal functionality. The structure and morphology of the hybrid polymer network were characterized by ATR-FTIR reflectance, X-ray photoelectron spectroscopy, and AFM and SEM images.Grafting poly(ethyleneimine) on the hybrid polymer film further increase the density of amino group, thus more CHPTAC can be grafted onto the hybrid polymer film. Due to the increase density of grafted CHPTAC, the polydopamine/silane coupling agent/poly(thyleneimine)-CHPTAC film shows stronger antibacterial properties. |
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