Abstract

In this work, some rheological and optical properties of natural rubber solutions in toluene with different concentrations have been studied at a range of temperature (20-50)0C. The results show that increase of density , viscosity , refractive index , Brewster angle , and refractance values with increasing polymer concentration . The value of the same properties decrease for each concentration with increasing temperature . On the contrary, critical angle appears apposite behaviour. This results suggest there is association between polymer and solvent molecules and also there is association between polymer molecules it self .