An infrared spectroscopic investigation of the Na+, K+, Rb+, and Cs+ salts of ethylene-and butadiene-methacrylic acid copolymers has been carried out. The absorption due to the asymmetric stretching mode of the carboxylate ion contains two components: one at 1550 cm-' and another at 1565 cm-I. The ratio of peak intensities of these bands depends upon ion concentration, the nature of the cation, and temperature. It is concluded that the ion pairs in these copolymers are likely to exist in at least two types of ionic aggregates of different structures. Infrared dichroism studies established that the dichroic ratios of the 1550-and 1565-cm-' bands depend on ion concentration in copolymers. The model systems, anhydrous salts of fatty acid, were also studied. A combination low-angle x-ray scattering and infrared data leads to a probable model of the ordered structure existing within ionic clusters.
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