Abstract
The molecular weight dependence of the viscoelastic properties of polystyrene-based ionomers was examined. To measure the physical properties, a Rheometrics dynamic analyzer (RDA) was utilized for the poly(styrene-co-sodium methacrylate) (4 mol%) system, while for the poly(styrene-co-sodium styrenesulfonate) samples (5 mol %) the studies were performed on a dynamic mechanical thermal analyzer (DMTA). In the methacrylate samples of high molecular weight (>100 000), the plot of tan δ vs temperature showed two peaks, as in other ionomers. However, for samples of the lowest molecular weight (ca. 21000), the tan δ plot showed only one peak and a shoulder
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