Preparation Of Fluorinated Acrylate Coatings And Research On Their Antifouling And Anticorrosion Properties

Acrylic polymers have the ability to form coatings with good gloss,strong adhesion,strong weather resistance and water resistance,and have been used as high-grade decorative paints.Fluorinated acrylate polymers,on the other hand,have better properties due to the introduction of the fluorine-containing groups.Fluorinated acrylate polymer coatings have great applications especially in the field of antifouling and anticorrosion of metals.The work of this thesis mainly focuses on the preparation of fluorinated acrylate polymer coatings and investigation on their properties of antifouling and anticorrosion.The contents are shown in following.1.In the introduction,the preparation methods,superior performance and application aspects of fluorinated acrylate coatings are reviewed,and the antifouling anticorrosion methods of steel are also discussed.2.Spin-coating of fluorinated acrylate polymer.The blends of poly(poly(ethyleneglycol)methacrylate)and poly(dodecafluoroheptyl methacrylate)in DMF in varying ratios were coated on dodecylthiol SAM modified gold substrate using the spin-coating method.Grazing angle reflectance infrared microscope(GIR),X-ray photoelectron spectroscopy(XPS),ellipsometry,contact angle measurement(CA),atomic force microscopy(AFM),scanning electron microscopy(SEM),and inverted fluorescence microscopy methods were used to characterize the chemical composition,surface morphology and antifouling properties of the spin-coated films.Experimental results show that with the decrease of DF component,the fluorine content on the coating surface does not show a decrease,suggesting the enriching effect of fluorinated component;for the coating with the composition of WDF:WDG=3:1,relatively smooth surfaces were observed;with the increase of DG content,evenly distributed nanoscale particles on the surface were observed;for the coating with the composition of WDF:WDG=1:3,the membrane showed highest antifouling property against the adsorption of the protein fibronectin.3.Direct electropolymerization of fluorinated acrylate monomer.The redox potential of a fluorinated acrylate monomer perfluorohexylethyl acrylate was surveyed using cyclic voltammetry(CV)in DMF with the supporting electrolyte of tetrabutylammonium bromide,and its reduction potential was determined.Thus the direct electropolymerization of the monomer were conducted on the surfaces of stainless steel plate and stainless steel mesh.Surface analytical techniques including GIR,XPS,CA,ellipsometry,SEM,inverted fluorescence microscopy were used to characterize the composition,electropolymerization mechanism,surface morphology,etc.Electrochemical linear sweep CV was used to determine the anticorrosion property of the coatings,and protein adsorption experiment was used to test the antifouling property.Nanoscale aggregates with the particle size of less than 100nm were formed and evenly distributed on these surfaces,and the formed particle sizes decreased with the electropolymerization time.By comparing the coatings obtained in different electropolymerization times,it was found that the coating with a polymerization time of 70 s had a lowest surface energy,attributed to the synergistic effect of surface architecture and fluorinated component content.For the coating with a polymerization time of 100 s,it had a lowest adsorption to the protein fibronectin,meaning a highest antifouling property.Meanwhile this coating gave the best anticorrosion capability.4.Direct electropolymerization for the preparation of the composite coating of(polyethylene glycol)methacrylate monomer and fluorinated acrylate monomer.Using the similar procedure described as above,the two monomers were directly electropolymerized in sequential firstly in water in the presence of ammonium persulfate then in DMF,to achieve the composite coatings on stainless steel surfaces.The surface analytic techniques were also used to characterize the chemical composition,surface morphology,and the antifouling and anticorrosion properties of the coatings.The results show that nanoscale aggregates with the particle size of less than 100nm were formed and evenly distributed on these surfaces,and the formed particle sizes decreased with the electropolymerization time.When the polymerization time for FOA was 300 s,the maximum water contact angle was realized;whereas when the polymerization time for FOA was 50 s,the highest antifouling and anticorrosion properties were achieved,probably attributed to the optimized content ratio of the monomers in this coating.