Enhancing the anticorrosive and antimicrobial activities of polyurethane-urea coating using 4-nitro-o-phenyl diamine intercalated with hybrid-SiO2

Corrosion creates the unending gradual deterioration of the surface materials (like metals, plastics, ceramics, etc.) triggered by chemical reactions of these materials with the environment and, later, its total spoilage. To address these anomalies, 4-nitro-o-phenyl diamine (4NPD) and peripheral modifications of silica nanoparticles with 3-aminopropyltrimethoxysilane (APTMS-SiO 2 ) in the presence of an extender poly(epichlorohydrin-triol) (PECH-triol) were all coupled into a Castor seed oil (CSO) based urethane coating systems. The prepared eco-friendly coating composites were synthesised with optimised 0.3 wt% 4NDP. The structural and morphological verification of the newly synthesised urethane composites was examined on Attenuated Total Reflectance-Fourier transform Infra-Red (ATR-FTIR), Energy-dispersive X-ray spectroscopy (EDX), Proton nuclear magnetic resonance ( 1 H NMR), Fourier Emission Scanning Electron Microscope (FESEM), and X-ray diffraction (XRD). The thermal stability of the coating films was investigated using a thermogravimetric analyser (TGA). The hydrophobicity, antimicrobial analyses, and corrosion studies were evaluated on the casted films and mild steel-coated panels. The films doped with APTMS-SiO 2 showed enhanced property values for various analyses, especially as the percentage composition of APTMS-SiO 2 increased. • Enhancing coating properties via the introduction of 4-nitro-o-phenyl diamine within a polyurethane-urea polymer matrix. • Using hybrid nanoparticles (APTMS-SiO 2 ) to increase the thermal stability, hydrophobicity, and anticorrosion properties of synthesised coatings. • Prompt spectroscopic analysis (NMR) is necessary.