ИСТИНА

The problem of protecting various surfaces from corrosion and static electricity is very relevant. Promising for these purposes is the use of conducting polyaniline (PANI). An enzymatic synthesis of conducting polyaniline (PANI) was performed in micellar solutions of the anionic surfactant sodium dodecylbenzenesulfonate (DBS). Laccase isolated from the culture fluid of Trametes hirsuta fungi served as a catalyst for the oxidative polymerization of aniline. The synthesis conditions have been optimized. The resulting PANI/DBS complexes were characterized by various physicochemical methods. The electrical conductivity of PANI measured by the standard four-point method was 0.7 mMs/cm. Anticorrosion and antistatic properties of the synthesized PANI/DBS complexes were tested. Electrochemical corrosion was modeled using the process of dissolving copper in an acidic environment under the action of an external electric potential. For this purpose the method of linear anodic voltammetry was applied. High purity copper (99.9%) was used as the electrode material, the measurement medium serving 0.1 M HCl. It was shown that PANI/DBS films deposited from toluene on the copper surface exhibited high adhesion to the metal surface and served as a protective anodic coating passivating and stabilizing the copper surface. The antistatic properties of PANI were estimated from the electrostatic discharge rate. The half-lives of positive and negative charges on the surface of cotton fabric treated with PANI/DBS complexes were 3.8 and 5.8 s, respectively, which is significantly less than the time of electrostatic discharge for control samples treated with DBS solution (154 and 114 s). Thus, conducting PANI obtained by enzymatic polymerization of aniline on a DBS matrix is a very effective antistatic and anticorrosion agent. This makes it promising for use as a protective coating.