Air drying polyesteramide from a sustainable resource

Air drying polyesteramide resins (APEAPh) were synthesized by minor incorporations of phthalic anhydride (PA) in poly(styrene-co-maleic anhydride) [SMA] based ambient cured polyesteramide (APEA); the latter prepared by the condensation reaction between N,N-bis(2-hydroxy ethyl) linseed oil fatty amide [HELA] and SMA copolymer in the presence of acid catalyst. The physico-chemical characterization like hydroxyl value, iodine value, saponification value, refractive index and inherent viscosity as well as solubility in different organic solvents were carried out by standard methods. The structure elucidation of the polymeric resin is based on FTIR, 1H NMR and 13C NMR spectroscopic analysis. The thermal stability behaviour was studied by TGA and DSC techniques. The coatings of 70 ± 5μm thickness were prepared on mild steel strips of standard size by brush technique. The scratch hardness, impact resistance, bend test, specular gloss and corrosion resistance test of these coatings show that the presence of phthalic anhydride considerably enhances the physico-mechanical and corrosion resistance performance of APEAPh as compared to those of APEA coatings. [Copyright &y& Elsevier]