Preparation Of Polyaniline Derivatives And Study On Antibacterial And Corrosion Resistance

As one of the most researched conducting polymers, PANI has attracted great attractions, but the inherent weakness tremendously limited its applications, therefore, the introduction of PANI derivatives could effectively overcome its shortcomings. In this paper, PANI derivatives were synthesized with different polymerization methods using oPD and oAP as monomers and their antimicrobial and anticorrosion activities were systematacially researched. And the details were listed as follows: (1) E.coli and S.aureus were used as experimental bacteria, PoAP, PoPD and the copolymer were synthesized using chemical polymerization and interfacial polymerization, respectively. Besides, the influence on antimicrobial activity of initiators, organic phases, the ratios of initiator/monomer and concentrations of monomers were also researched. In addition, SEM, BET, FT-IR and 1H NMR were used to characterize the products.(2) The antimicrobial mechanism and antimicrobial kinetics of PANI derivatives were systematically researched, it was concluded as contact antimicrobial mechanism and as the time prolonged antimicrobial efficiency gradually increased, up to 50 min, the antimicrobial efficiency climbed to 99.99%. Furthermore, the MIC of antibacterial materials were studied, it was 512 μg/ml toward E.coli.(3) Adherent electroactive films of poly (o-aminophenol-co-o-phenylendiamine) have been obtained by electropolymerization of o-aminophenol (oAP) and o-phenylendiamine (oPD) on X70 pipeline steel under potentiostatic conditions. For purpose of comparison, the corresponding poly (o-aminophenol) and poly (o-phenylendiamine) have also been obtained by electropolymerization. The homo and copolymer structures were confirmed by FT-IR and 1H NMR spectroscopy, and their thermostability were confirmed by TGA and DSC analysis. Besides, SEM and 1H NMR were used to characterize the products.(4) Potentiodynamic polarization studies of polymer coated X70 specimens in chloride solution revealed a positive shift of the corrosion potential. The morphologies of potentiodynamic polarized X70 steel specimens were observed by SEM.The surface of copolymer coated X70 steel exhibited uniform and less porous morphology.The corrosion potential-time behaviors of the modified X70 steels were conducted in a solution of 1 M HC1 and 1 M H2SO4, in which copolymer coated X70 spicemen remained passivated for a long time. The copolymer film exhibited a superior resistance in simulative sea water to other homopolymer films, which can be assigned to protection between the X70 steel surface and coated copolymer.