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Chemical structures and schematic molecular-level pictures of (a) neat SIS, (b) CB-filled NR,59 (c) i-SIS(Na), and (d) i-SIS(Ba). The gray spheres depict the isolated glassy polystyrene domains. Blue, red, and orange spheres depict the carboxylate anion, sodium cation, and barium cation, respectively. The black spheres depict particles of carbon black, whereas the small green dots represent a chemical cross-link. See also ref (42).
