Small-angle neutron scattering experiments (SANS) have been performed on sulfonated polystyrene ionomers. Sulfonate concentrations were studied over the range 0-8.5 mol % . The radius of gyration of the polystyrene ionomers showed a regular increase with increasing sulfonate content. The radius of gyration was insensitive to thermal annealing and remained unchanged at temperatures well above the glass transition temperature.
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Earnest et al. (1981) studied this question.
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