Ionomers are generally described by copolymers having either acrylic or methacylic acid as one component and the other component is mostly either ethylene or styrene. The objective ofthis research was to study the thermal behaviour and stability ofionomers ofstyrene with some alkali metal acrylates. These materials have been synthesized by neutralization of the respective copolymer containing 40 mole percent acrylic acid with sodium and potassium hydroxides in acetone medium. The copolymer of styrene-acrylic acid was made by solution polymerization in methanol using 2,2