Study of Corrosion Resistant Property of Benzoxazine Synthesised from Euginol with N-Butylamine and Copolymerised with Polyurethane on Mild Steel

Abstract

In this work, we have synthesized a new eugenol based benzoxazine monomer from eugenol, paraformaldehyde and n-butyl amine. The synthesized monomer was characterized by 1H NMR, 13C NMR, UV-Visible and FT-IR spectroscopy. The monomer was then co-polymerized with isocyanate hardener on the surface of the mild steel with three different composition. After that it was cured in a muffle furnace to get poly(benzoxazine-urethane). The copolymer’s characterized by UV and FT-IR spectroscopic techniques. The anti-corrosive property of the co-polymer was investigated using polarization and EIS techniques against 3.5% NaCl solution. For additional support for this work, DFT studies also carried out for monomer and its copolymer. Water absorption and gel absorption studies were also done to add evidences for the hydrophobicity of the monomer and the copolymers.