The market for commercial polymer blends has grown steadily. A good blend should have strong interphases between different parts of the constituted polymers. Lack of strong interphases is a classical problem of the blend industry. EPDM/SBR blends have a very good aging resistance and good compression sets. However, these rubbers are partially miscible. To improve the miscibility of EPDM and SBR in their blends, a Lewis acid, Al〖Cl〗_3 was used to form EPDM-g-SBR co-polymer through Friedel-Craft reactions. The existence of covalent bonds between EPDM-SBR macromolecules was studied by the cure traces of the blends, i.e. ∆torque, FTIR spectrums, DSC heat flow curves, TGA curves and SEM micrographs. Subsequently, several blends with EPDM/SBR ratio of 40/60 and with various Al〖Cl〗_3 amounts were prepared and after curing, their mechanical properties were measured and compared. The results showed covalent bonds formed between SBR-EPDM and SBR-SBR macromolecules. An exothermic change in heat flow in the DSC curve was observed around 111.28℃ which can be attributed to the formation of carbocations in Friedel-Craft reactions. Adding 2 phr AlCl3 had an efficient effect on EPDM-SBR and or SBR-SBR linkages. Some mechanical properties of the cured blends, i.e., tensile strength were lower when compared with corresponding values for prepared compound with SBR. Excellent compatibility between two polymers and strong interphases were observed in SEM micrograph of the cured blend with 1 phr AlCl3.

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