Engineering innovative nanomaterials with low volatile organic content (VOC) has awarded great interest to control air pollutant emissions. We designed a highly branched alkyd matrix suitable for surface coating from castor oil via polyesterification. A simple A2 + B3 (di- and tri-functional monomers) methodology was used to prepare the hyperbranched polyester from natural multifunctional monomers. Magnetite-coated silica (Fe3O4@SiO2) particles with 60–70 nm average diameter were prepared by in situ method that binds magnetite nanoparticles to silica nanospheres. The magnetite size and attaching efficiency were controlled by the concentration of chemicals and reflux duration. The nanocomposite coating was prepared by solution casting. The structure-property relationship was studied for different concentrations of nanofiller in the alkyd matrix. The surface and anticorrosive properties were studied via contact angle and salt spray tests. Mechanical performance and thermal stability were assessed by various methods. The highest improvement was achieved with nanofiller insertion up to 0.5% Fe3O4@SiO2 nanospheres.

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Available online 12 September 2017