Microwave-assisted preparation of urethane-modified polyetheramide coatings from Jatropha seed oil

We have developed urethane-modified polyetheramide (UPEtA) by the condensation polymerization reaction of N,N-bis (2-hydroxy ethyl) Jatropha oil fatty amide and hydroquinone to form polyetheramide (PEtA). Jatropha PEtA was further treated with toluylene-2,6-diisocyanate (TDI) in different weight percentage (15, 20, 25 wt%) to produce UPEtA. The structural elucidation of PEtA and UPEtA was carried out by Fourier transform infrared, proton nuclear magnetic resonance and carbon-13 nuclear magnetic resonance spectroscopic techniques. The coatings of UPEtA were prepared on mild steel strips to investigate their physico-mechanical and corrosion resistance performance. Physico-chemical and physico-mechanical tests were performed by standard methods. Corrosion resistance tests were examined in different corrosive media, such as 3.5 wt% HCl, 3.5 wt% NaOH, 5.0 wt% NaCl, water and xylene. The thermal behavior of UPEtA was studied by thermogravimetric analyses. Our studies revealed that UPEtA may find application as an eco-friendly corrosion protective coating and may be safely used up to 200^oC.