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Development of Functional Polyurethane–ZnO Hybrid
Nanocomposite Coatings from Thevetia peruviana Seed Oil
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Abstract
The present article reports eco-friendly multifunctional
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