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Curing of relatively thin polymer films via radiation polymerization is prevalently used in different applications such as varnishes, paints, printing inks and adhesives on account of their superior properties. Polyurethane acrylate resins are among the well known binders used in UV curing industries. In most of the applications, such as head light in automotive industries, we need a very good scratch resistance. Hence, this study has been performed concerning the improvement in scratch resistance of UV curable polyurethane acrylate coatings via embedding of pretreated nano alumina particles. The scratch resistance of the prepared coatings was determined by using nanoindentation method. The hardness of prepared films was evaluated by using a Vickers micro hardness tester and also the nano-indenter. In addition, a pull-off tester used to evaluate the adhesion strength of the coatings. The results indicated a considerable improvement in the mentioned properties of the coatings by incorporation of the nano-alumina particles.
