Abstract
An electroactive polyimide was first synthesized from oligoaniline monomers (4,4′-(4,4′-isopropylidenediphenoxy)-bis(phthalic anhydride) (BSAA), N-Phenyl p-phenylenediamine) and p- phenylenediamine by forming electroactive polyamic acid (EPAA) using oxidative coupling polymerization. Separately, graphitic carbon nitride (g-C3N4) particles were synthesized by thermal decomposition of melamine at 550 °C. Then, g-C3N4 particles with different weight percentages (2, 5, 10, and 20) were incorporated into EPI matrix during oxidative coupling polymerization followed by thermal imidization. The structure and morphology of EPI, g-C3N4 and its composites were confirmed by XRD, XPS, FTIR and FESEM analysis. Composites showed higher thermal stability by TGA. Electrical conductivity of EPI/g-C3N4 composites indicates decrease of conductivity with the addition of g-C3N4 content in EPI matrix. The EPI and EPI/g-C3N4 composites were coated on three different metals (316L SS, carbon steel and AA6061) using spin coating method. An anticorrosion property of all coated samples was determined using potentiodynamic polarization method in 5% NaCl aqueous solution at room temperature and revealed that EPI/g-C3N4 composites coated metals show better anticorrosion properties than bare metals.
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