Experimental Analysis of Physical/Mechanical Behavior of Transparent Nanocomposite Coats made of Polyurethane/Alumina Nanoparticles

In this study, physical/mechanical properties of transparent nanocomposite coats based on polyurethane with different weight fractions of alumina nanoparticles was studied. Physical/mechanical properties was studying employing impact, bending, tensile tests and dynamic mechanical thermal analysis (DMTA). The state of nanoparticles spreading in coats was studied using of a field emission scanning electron microscopy (FESEM). It was observed that by increasing nanoparticles up to 2 wt. % tensile strength and energy at break point and up to 4 wt. % cross bond density and storage modulus of the coats improves. It was also seen that impact and bending strength of nanocomposites didn’t decrease because of good flexibility of polyurethane in low weight fractions. Improving physical/mechanical properties of nanocomposites was related to the good spreading of nanoparticles in coats and their high modulus. Nanoparticels could also dissipate the exerted energy in interface of coat/nanoparticles and improve the strength of the samples.