INTRODUCTION Maleic anhydride (MAH) is a useful functional monomer for the graft modification of polymers [1] [2] [3] [4] . The application of maleic anhydride on the non-polar backbone of polymers has overcome the disadvantages of the low surface energy of these polymers [5] [6] [7] . Maleic anhydride-grafted polymers have good affinity to metal or metal oxides such as Cu, CuO and ZnO. This improves the hydrophilicity of the polymer surface and the adhesion of rubber with polar/non-polar

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... als [8] [9] [10] [11] [12] . Ethylene-propylene-diene terpolymer (EPDM) is a synthetic rubber composed of ethylene, propylene and unsaturated diene. Its advantage is weather, heat and solvent resistance, which continues to grow in a wide variety of applications [13] [14] [15] [16] [17] [18] . Maleic anhydride-grafted ethylene-propylenediene terpolymer (MAH-g-EPDM) as a compatibilizer in polymer blends has been reported to be useful for improving the properties of the blends 10, [19] [20] [21] . An ionomer is an ion-containing copolymer crosslinked by metal ions 22, 23 . In general, metal cations such as Na + , Zn 2+ and Ca 2+ are used, while CO 2and SO 3are used as anions to form an ionomer. When the ionomer is heated, crosslinks formed by ions will lose their attraction, but the crosslinks reform again during cooling giving it good mechanical properties [24] [25] [26] .