Preparation of urethane nanocomposites with inorganic nano fillers and their physical properties

Nanocomposites of polyurethane were prepared from inorganic nano particles, Na+-montmorillonite (MMT), silica, CaCO3, and surface modified MMT and their properties were investigated. It was shown that the molecular weight and polydispersity of nanocomposites of polyurethane were 20000 to 28000 and 1.0 to 2.0, respectively. d-Spacing for nanocomposites of MMT were increased than that of pure MMT. Initial degradation temperature of nanocomposites were 250 to 280 degrees C. And also, the range of weight loss for nanocomposites were decreased and the end of thermal degradation was observed at higher temperatures about 50 V. The elongation at break for CaCO3 filled nanocomposites; were the highest among the nanocomposites used in this study studied. It was found that the tensile strength increased with increasing the filler contents while the silica nanocomposite exhibited the lowest increase and the CaCO3 nanocomposite the highest.