Polystyrene (PS) and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) are known to be miscible in all composition ranges. The origin of the interaction responsible for the miscibility is unknown but has been suggested relating to the phenyl group coupling of the aromatic moieties. Copolymers of polystyrene, however, are found to have composition ranges that are either miscible or immiscible with PPO. It is therefore suggested that miscibility between a polymer pair can be related to favorable 'attractive' segmental interaction and 'repulsive' interaction as well. In this paper, a long-range interactive force that is electrical in nature is include in the copolymer to study its effect on miscibility. A series of poly(styrene-r-t-butyl acrylate) (PS-tBA) copolymer is prepared and the t-butyl acrylate group is subsequently hydrolyzed, and then neutralized to form potassium salt of the carboxylic acid.