Design And Preparation Of Functionalized Graphene Oxide/Polyphenoxy Composite Coatings And Its Performance Study

With the rapid development of modern equipment technology,the service conditions of high-end machinery and equipment have become more complex and demanding.Serving equipment not only exists the surface wear,but also face the damage of corrosion.In particular,the wear and corrosion of the key moving parts in marine equipment has become a key common problem that restricts its efficient and stable service.The development of new friction-reduction,wear resistance and corrosion resistance composite coatings technology for marine environment is undoubtedly the most feasible technical way to solve the corrosion and wear of moving part in marine environment.Polyphenoxy resin(PHE)is a widely used in engineering plastic and coatings because of its excellent flexibility and mechanical strength.However,science PHE is a room temperature curing thermoplastic resin,its application in the field of wear and corrosion protection is limited due to poor heat resistance and porosity defects.The modification of polymer by nano-filler graphene oxide(GO)to reinforcing their comprehensive performance is one of the effective measures to break through their performance.However,factors such as dispersion and orientation of GO are the key factors that determine the improved performance of composite coating.Therefore,the significant performance of nano-filler to play a complementary role mainly depends on two conditions: ?.GO should have good dispersion in the resin to avoid local defects in the composite coating caused by agglomeration.?.The induced orientation of GO,that is,to achieve the anisotropy of graphene-like two-dimensional nanomaterials,thus achieving controlled regulation of the state of GO in composites,will undoubtedly have a substantial advancement on the application of GO nano-filler.Based on this,this paper firstly,modification of GO was carried out by chemical grafting and the design,preparation and application of functionalized GO in polymer composites were studied.Secondly,the influence of the composition and structure of the composites on their wear and corrosion resistance properties systematically investigated,and the wear and corrosion resistance mechanism of the composite coatings was studied.Finally,with the GO which has significantly improved dispersion,the oriented arrangement of GO was oriented by the applied electric field induction method,and the effect of different electric field parameters on the oriented arrangement of GO and affect on the mechanical properties of the composites was discussed.The main study contents and results are as follows.1.Surface functionalized GO(AOFG)was obtained by grafting aniline oligomer(AO)onto GO by chemical modification.It was found that,after surface-modification,AOFG has good dispersion and dispersion stability in organic system.2.AOFG/PHE composite coatings were prepared by incorporating AOFG into PHE.For comparative illustration,unmodified GO was added to PHE in the same way to make GO/PHE composite coatings.The results showed that the introduction of both GO and AOFG could enhance the mechanical properties,wear resistance and corrosion protection of the PHE composite coating,and the enhancement effect of AOFG was better than GO.This is because AOFG has better dispersion,and at the same time,the grafted AO forms and organic interpenetrating structure with PHE hydrogen bonding,which effectively enhances the interfacial interaction between AOFG and PHE matrix,thus effectively enhancing the mechanical protection properties of the composite coatings.3.D-GO/PHE and D-AOFG/PHE composites were prepared by electric filed induction to investigate the effect of electric field on the mechanical properties of the composites.The differences of mechanical properties of D-GO/PHE and DAOFG/PHE composites at different voltages were firstly compared,and then the anisotropy of mechanical properties of D-AOFG/PHE composites at different voltages and electrode plate distances were explored.The results show that the electric field can further improve the dispersion of AOFG in the PHE matrix,and there is a tendency of orientated arrange for AOFG.Moreover,the difference in the degree of AOFG orientation leads to the difference in the anisotropy of the mechanical properties of AOFG/PHE composites.The mechanical properties of D-AOFG/PHE composites exhibit the best anisotropy at 980 V,500 Hz,and 6 mm electric field parameters.