Mohammad Altaf

Polyester‐urea coatings were synthesized from corn oil with the help of a series of reactions in three different compositions by varying the amount of urea. Out of all the synthesized compositions, the best composition was optimized based on various parameters. The optimized composition was used as a matrix and graphene oxide (GO) was incorporated in three ratios, for the formulation of corn oil‐based CPEUr@GO nanocomposites. Fourier transform infrared spectroscopy was used to confirm all the reactions. The physico‐mechanical properties of CPEUr 2 coating were found to be the best among all the compositions. Therefore, CPEUr 2 was selected as a matrix for the inclusion of GO nanosheets to prepare CPEUr 2 @GO nanocomposites. Thermogravimetric analysis results showed that incorporation of GO enhanced the thermal stability of CPEUr 2 up to 325°C. The anticorrosive studies revealed the high impedance value of 6.5 × 10 5 Ω.cm 2 in case of CPEUr 2 @GO 0.5 . Furthermore, it can be concluded that the inclusion of 0.5 wt% GO proved to be the optimized amount to produce sustainable CPEUr 2 coatings with good performance. These CPEUr@GO nanocomposite coatings can be used for various protective purposes owing to their excellent physico‐mechanical thermal as well as anticorrosive performance. Highlights Corn oil‐based polyester‐urea, CPEUr, coatings were synthesized in three different compositions. The best composition was used as a matrix for the formulation of CPEUr@GO nanocomposites. Graphene oxide of 0.5 wt% was found to be the optimum quantity required to modify CPEUr matrix. Thermal stability, mechanical durability as well as corrosion resistance performances were enhanced. The environment friendly approach is suitable for the development of corrosion protective coatings.

This work describes the synthesis of a hydroxy‐terminated oligomer for polyurethane preparation (HTO‐PU) from rapeseed oil, salicylic acid and toluene diisocyanate. HTO‐PU was further incorporated with different amounts of multiwalled carbon nanotubes (MWCNTs) to produce HTO‐PU@MWCNT nanocomposites. These nanocomposites were then converted to coatings using mild steel strip as a substrate and allowed to cure at room temperature. Fourier transform infrared and NMR spectroscopic techniques were used for structural elucidation. Surface morphology was determined using scanning electron microscopy and X‐ray photoelectron spectroscopy. Thermal stability (>300 °C) of these coatings was evaluated through thermogravimetric analysis and differential scanning calorimetry. Contact angle values suggest that incorporation of MWCNTs enhanced the hydrophobicity of HTO‐PU coatings. Physicomechanical results reveal that these coatings are highly glossy, scratch resistant and impact resistant possessing good adhesion and excellent pencil hardness. The optimum concentration of MWCNTs was found to be 1.0 wt. %, below and above which the coating performance was observed to deteriorate. The corrosion resistance and barrier properties of these coatings were examined using electrochemical impedance spectroscopy, the results of which suggest excellent corrosion inhibition efficiency of HTO‐PU@MWCNT‐1.0 coatings until 28 days. This study suggests a step towards synthesis of MWCNT‐incorporated green PU coatings for protective applications. © 2022 Society of Industrial Chemistry.