Abstract
The salt-free polyelectrolyte behavior of random ionomers, i.e., partially sulfonated polystyrene (SPS) (Na salt: MW=400 000) having less than 5 mol % of ionic groups, dissolved in DMF0 was studied by angular light scattering measurements. At low ionomer concentration, «abnormal» Zimm plots, showing negative slopes in reciprocal reduced scattered intensity vs scattering vector curves, are observed. These effects arise because the scattering is dominated by eternal interference arising from strong electrostatic interactions between charged ionomer chains. The behavior can be explained by using general relations derived by extending the approach of Doty and Steiner
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