: The aim of this study was to develop thermoplastic elastomers based on polypropylene (PP)and reclaimed tire rubber (RTR).The effects of nano clay and virgin rubber (i.e. NR and EPDM) addition to thermoplastic elastomers on mechanical properties of alloyswere investigated.Several thermoplastic elastomers vulcanized(TPV) based on PP and RTR were prepared under dynamic conditions of melt mixing. The tensile behavior of PP/RTR samples showed that addition of RTR had a negative effect on elongation at break compared to pure PP. Impact strength, however, exhibited a slight improvement. The results obtained from the mechanical properties of NR/PP/RTR blends also showed that NR addition significantly promoted the elongation at breakof PP/RTR blends. In the next step, fracture surface morphology of organoclay supplemented(cloisite 15A) in ternary blend of PP/RTR/NR was investigated by TEM and SEM methods. In addition, nano-dispersed structure of the samples was investigated using XRD analyses. The SEM and TEM images suggested a decrease in size of dispersed-phase droplets by increasing nano clay contents. This may have assigned to the higher shear stress exerted to matrix in the presence of nano clay. As expected, addition of 1Phr nano clay to TPV blends based on PP/RTR/NR made a 270% increase in impact strength, while further addition of nano clay decreased impact strength. The modulus of samples increased with nano clay addition whereas elongation at break and tensile strength decreased.
