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Thermoplastic elastomers have attracted considerable attention in commercial and research fields because they have the processing properties of thermoplastics as well as the performance of typical elastomers. An ionomer is a polymer with a small mole fraction of ionic groups bonded to the polymer backbone. It is not a chemically crosslinked polymer but a type of thermoplastic elastomer with a reversible crosslinker. Ethylene-propylene-diene terpolymer (EPDM) is a popular synthetic rubber with good weather resistance and electrical resistivity. Modification of rubbers with maleic anhydride (MAH) is a useful way of imparting the compatibility to immiscible polymer blends as well as improving the interfacial adhesion in polymeric composites. MAH-grafted EPDM (MAH-g-EPDM) is one of the useful MAH-modified elastomers. In the present work, thermoplastic elastomers composed of MAH-g-EPDM, zinc oxide and amino acid were prepared. Ionic bonds can be formed between the amino acid-modified maleic acid groups and zinc oxides. The thermoplastic elastomers were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), solvent swelling behaviours including crosslink density and physical Properties of Thermoplastic Elastomers Made of MAH-g-EPDM, Zinc Oxide and Amino Acids†