A study has been made of the effect of the concentration of carboxyl groups and their distribution along the copolymer chain on the thermomechanical and physicomechanical properties of ionomers. It is shown that when there is a random distribution and a low concentration of carboxyl groups in the polymer the degree of neutralization and the nature of the cation has little effect on the transition temperatures of ionomers. When the concentration of carboxyl groups is high the thermomechanical characteristics of neutralized samples are dependent on the concentration and nature of the cation.