Effect of organoclay on the physical properties of UV-curable coatings
İnceoğlu, Funda and Dalgıçdir, Cahit and Menceloğlu, Yusuf Z. (2009) Effect of organoclay on the physical properties of UV-curable coatings. In: Fernand, Raymond H. and Sung, Li-Piin, (eds.) Nanotechnology Applications in Coatings. ACS Book series. Oxford University Press, Oxford. ISBN ISBN13: 9780841274488, ISBN10: 0841274487
The combination of UV-curing and nanocomposite technology has been studied to produce cost-effective coatings with superior physical and mechanical properties. The clay was modified with dimethyl dihydrogenated-tallow quaternary ammonium salt and made organophilic. The effect of the organoclay(2-10 phr) on curing rate, mechanical, thermal and physical properties of a urethane-acrylate coating has been determined. X-ray diffraction analysis, AFM, SEM and TEM images as well as the tensile properties of different formulations have confirmed the uniform distribution of organoclay in polymer matrix. At 3 phr organoclay addition, the UV-cured film exhibited the best mechanical performance due to the formation of both intercalated and exfoliated morphologies. Curing time was reduced and the initial thermal decomposition temperature shifted 50°C to higher temperature by the incorporation of small amount of organoclay. The nanocomposite coating was also found to be more resistant against scratching compared with clay-free coating.
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