Abstract
A novel attempt has been made to incorporate azomethine group in the backbone of polyurethane etherPongamiaoil fatty amide. The overall reaction was carried out in different steps like preparation of N,N-bis(2-hydroxyethyl)Pongamia glabraoil fatty amide, poly(ether fatty amide), and poly(urethane-ether) fatty amide. The hydroxyl terminated Schiff base, ethane 1,2-di(azomethine) bisphenol, reacts with fatty amide diol and is further treated with toluylene 2,4-diisocynate (TDI) to form poly(urethane-ether azomethine) fatty amide (PUEAF). These synthesized resins were characterized by FT IR,1H NMR, and13C NMR spectroscopic techniques. Molecular weight of PUEAF resin was measured by gel permeation chromatography (GPC), coating was made on mild steel strips, and evaluating their physicochemical and physicomechanical analysis was carried out by standard methods. The PUEAF25 coating showed highest scratch hardness (2.5 kg), gloss (90) at 45°, pencil hardness (4H), and impact resistance (150 lb/inch). Atomic force microscopy (AFM) and differential scanning calorimetry (DSC)/thermogravimetric analysis (TGA) were used to determine the topography and thermal behavior of PUEAF. Corrosion studies of PUEAF coated mild steel were used in different corrosive media (3.5 wt% HCl, 5 wt% NaCl, and tap water) at room temperature using potentiodynamic polarization technique. The results of this study showed that PUEAF coatings exhibit good physicomechanical, anticorrosive properties and get application up to 180°C.
Highlights
Organic coatings are widely used for protection of mild steel against corrodents and to provide aesthetic appeal
FT IR spectra of HEFA, poly(ether azomethine) fatty amide (PEAF), and poly(urethane-ether azomethine) fatty amide (PUEAF) resins were taken on FT IR spectrometer, Spectrum 100, Perkin Elmer, USA. 1H and 13C NMR spectrum were recorded on Jeol DPX 400 MHz using deuterated chloroform/dimethyl sulphoxide as solvents and tetramethylsilane as an internal standard
EAB was synthesized by chemical reaction between 4-hydroxybenzaldehyde and ethylene diamine
Summary
Organic coatings are widely used for protection of mild steel against corrodents and to provide aesthetic appeal. Various types of polymeric organic coatings from different renewable resources like lignin, cellulose, vegetable oils [VO], and others are used to protect mild steel [1,2,3,4]. VO are one of the most important renewable resources for production of polymeric materials like alkyd, polyesteramide, polyetheramide, polyurethane, polyester, polyepoxy, and polyamine amide in combination with commercial polymers such as polyvinyl alcohol, polystyrene, polymethylmethacrylate, and polyurethane [11,12,13,14,15]. The utilization of VO has attracted great attention in both scientific and industrial applications due to easy availability, environmental friendliness, low volatile organic matter, and cost-effectiveness [24,25,26,27]
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