Development of Functional Polyurethane–ZnO Hybrid Nanocomposite Coatings from Thevetia peruviana Seed Oil
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The present article reports eco-friendly multi-functional polyurethane–ZnO hybrid nanocomposite coatings obtained from Thevetia peruviana seed oil (TPSO). Initially, the polyols were prepared by treating TPSO with glycerol and the formation was supported by Fourier transform infrared (FT-IR) and 1H-NMR studies. In the next stage, siloxane functionalized ZnO nanoparticles were added to the polyol mixture in different weight percentages (0, 1 and 2 %) and then treated with excess 4,4′-diisocyanatodicyclohexylmethane (H12MDI) in order to synthesize isocyanate terminated polyurethane nanocomposites. The polyurethane hybrids were then casted as thin films and cured under atmospheric moisture. After complete curing they were characterized by using FT-IR, 1H-NMR, 13C-NMR, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and dynamic mechanical thermal analysis techniques. The hybrid nanocomposites showed superior thermo-mechanical and anti-corrosive properties compared to pristine polyurethane. Also, due to the presence of nano ZnO in the polyurethane matrix, the composite coatings are showing excellent resistance towards various bacterial and fungal stains.
KeywordsThevetia peruviana seed oil Nanocomposite Polyurethane coatings Thermal analysis
The author, Dr. Tolutope O. Siyanbola is grateful to TWAS and CSIR (India) for the TWAS-CSIR 2010 Postgraduate Fellowship Award. The Indian Institute of Chemical Technology and CSIR Intel-Coat Project (CSC-0114) are appreciated for providing the enabling environment needed for my bench work. Covenant University Ota, Nigeria is well appreciated for creating the platform leading to the award of my Ph.D. Dr. Tolutope O. Siyanbola is also thankful to Prof. K.O. Okonjo, Dr. Oladele O. James, Adeogo Adedayo, Oluwatoni Siyanbola, Toluwase Siyanbola and Mrs Tunmike S. Siyanbola for their support.
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