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Highly dispersive waterborne polyurethane/ZnO nanocomposites for corrosion protection

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Abstract

The interfacial interactions between surface-modified zinc oxide with oleic acid (OA-ZnO) and polymer matrix have important effects on the properties of nanocomposites. This zinc oxide nanoparticle was synthesized and characterized by various techniques such as field emission scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The water contact angle of waterborne polyurethane (WPU) nanocomposites is found to be increased with the addition of OA-ZnO compared with pure WPU. The corrosion protection of the polyurethane nanocomposites coatings on mild steel was assessed by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. Coating with OA-ZnO in the WPU matrix showed the enhancement of resistance of mild steel to corrosion. This can be related to the surface modification by oleic acid which enhances the dispersion of nano-ZnO and improves the corrosion resistance of the WPU coating. Compared with unmodified ZnO nanoparticles, there were noticeable improvements in the hydrophobicity, corrosion protection, and uniform dispersion without agglomeration, and also improvement in the antisettling behavior when surface-modified ZnO nanoparticles with oleic acid (OA-ZnO) were used.

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Acknowledgments

The authors wish to thank Piccassian Polymers for providing polymer materials and the National Centre for Nano Science and Nano Technology, University of Madras, Chennai, for providing HRTEM and FESEM facilities.

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Authors and Affiliations

  1. Department of Polymer Science, University of Madras, Guindy Campus, Chennai, 600 025, India

    Gnanaprakasam Christopher & Gurusamy Harichandran

  2. Electro-organic Division, Central Electrochemical Research Institute, Karaikudi, 630006, India

    Manickam Anbu Kulandainathan

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  1. Gnanaprakasam Christopher
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Correspondence to Gurusamy Harichandran.

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Christopher, G., Anbu Kulandainathan, M. & Harichandran, G. Highly dispersive waterborne polyurethane/ZnO nanocomposites for corrosion protection. J Coat Technol Res 12, 657–667 (2015). https://doi.org/10.1007/s11998-015-9674-3

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