Abstract
Ethylene—propylene-diene (EPDM) terpolymers with different amounts of microgel and long-chain branching have been characterized by dynamic mechanical experiments. Low frequency measurements were found particularly useful for revealing differences in viscoelastic properties of the samples Loss factor values were of limited use, as they are influenced by sample molecular weights. Modified Cole—Cole plots were verified to be molecular weight independent, and could therefore be employed to detect molecular architecture variations. It was determined that long-chain branching and microgels are almost entirely localized in the higher molecular weight fractions of the investigated EPDM samples.
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