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Epoxy-based anticorrosive coating developed with modified poly(o-anisidine) and depolymerized product of PET waste

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Abstract

Poly(o-anisidine) (POA) is used as a modifier in an epoxy system to enhance its anticorrosive properties. The modification of POA is done by aminosilane to introduce amine functionality on the surface. Through this functionality, it becomes part of the coating backbone during curing of an epoxy-polyaminoamide system. The concentration of poly(o-anisidine) has been varied as 1, 3, and 5 wt%. Depolymerized product of polyethylene terephthalate (PET) obtained from aminolysis of PET with ethylamine has amine functionality. Depolymerized product is added at concentrations of only 1 and 3 wt%. The same concentration is used with 5 wt% of silane-modified POA. The synthesized POA and silane-modified POA (Si-POA) have been characterized by FTIR, UV–Visible, and XRD analysis. The coating is characterized by mechanical properties and it is observed that pencil hardness and scratch hardness of the coating were enhanced to 6H and 3.5 kg from 2H and 2.5 kg of a plain epoxy system. The anticorrosive properties of Si-POA are better as compared to plain POA, but the addition of depolymerized product is unable to improve the anticorrosive performance of the coating. In EIS study, it is observed that 5% Si-POA system shows the highest impedance > 10 G (Ω) and it has a tendency to retain anticorrosive performance for longer duration.

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Acknowledgements

We would like to express our sincere thanks to DST INSPIRE, New Delhi for providing the support in terms of fellowship.

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  1. Department of Polymer and Surface Engineering, Institute of Chemical Technology, Mumbai, Maharashtra, India

    Aarti More & Shashank Mhaske

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  1. Aarti More
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  2. Shashank Mhaske
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Correspondence to Shashank Mhaske.

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More, A., Mhaske, S. Epoxy-based anticorrosive coating developed with modified poly(o-anisidine) and depolymerized product of PET waste. Iran Polym J 27, 359–370 (2018). https://doi.org/10.1007/s13726-017-0589-y

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  • DOI: https://doi.org/10.1007/s13726-017-0589-y

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