The dynamic behavior of latex polystyrene/crosslinked polystyrene (PS/XPS) systems has been studied. PS and XPS lattices were either physically blended, or used as seeds in semi‐continuous sequential two‐stage polymerizations. The Cox–Merz equation is not met by any PS/XPS system. Power‐law relaxation has been observed for the physically blended PS–b–XPS system in the terminal region. A two‐parameter equation suggested for polymers at the critical gel point fits the experimental data for XPS contents beyond 60%. This has been attributed to the formation of a “continuous” XPS network. This network is able to disrupt upon flow, due to the unique morphology of the XPS phase. It is possible that, for the sequential system with XPS seed particles, such a network may appear at a lower XPS content, due to a PS occlusion effect. A qualitative model is presented for these PS/XPS systems.
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Nemirovski et al. (1993) studied this question.
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