Abstract
Three lightly sulfonated polystyrenes containing 6.1 mol % sulfonate groups neutralized with Ni 2+ , Cd 2+ , and Zn 2+ were studied with the EXAFS technique. Using the simulation package FEFF5, it was found that the atomic arrangement whichled to the best description of the experimental data was very similar for the nickel- and zinc-neutralized materials. Nickel was octahedrally coordinated to oxygen in the first shell, while zinc was tetrahedrally coordinated to oxygen. In both cases, the second shell was sulfur atoms with a metal-oxygen-sulfur angle of 135-140 o
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