ABSTRACT The performance of polyurethane (PU) coatings in corrosive environments is often limited by electrolyte permeation and interfacial degradation, despite extensive modification strategies reported in the literature. In this study, a hybrid PU coating system incorporating 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO), an acrylic component, and garnet filler is systematically investigated. Phosphorus‐based urethane and cyclohexanone‐derived PU, along with acrylic‐ and garnet‐modified variants, were synthesized and characterized using Fourier transform infrared spectroscopy (FT‐IR), nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDS), and thermal, mechanical, optical, and wettability analyses. Thermal behaviour was evaluated using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Corrosion protection performance was assessed by electrochemical impedance spectroscopy, and the impedance data were quantitatively analyzed using equivalent circuit modeling to extract coating resistance, capacitance, and charge‐transfer parameters. The hybrid coatings exhibited enhanced thermal stability, higher char yield, improved hydrophobicity, and superior barrier performance compared with unmodified PU. Garnet incorporation increased charge‐transfer resistance and reduced ion diffusion, while DOPO and acrylic modification influenced curing behaviour and charge transport characteristics. These results provide quantitative structure–property–electrochemical correlations and support the application of hybrid PU coatings as multifunctional protective materials.
Umasankar et al. (Thu,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: