Abstract
The relaxation and conductivity properties of ionomers based on styrene-isoprene-styrene triblock copolymers modified by maleic anhydride were investigated from 100 to 400 K by means of thermally stimulated depolarization and polarization methods, stressing the comparison of materials containing alkaline and alkaline-earth cations. It was shown that the behavior is largely determined by the thermal stability of ionic associations and their ability to trap charge carriers. With alkaline-earth cations, the associations are thermally stable at least up to 400 K, which gives rise to a conductivity level smaller than that of the starting material by several orders of magnitude. An opposite result is observed with alkaline cations as a consequence of the thermal breaking of ionic associations, which occurs in the glass transition range and results in a rapidly growing number of mobile ions.
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