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Creep and creep recovery experiments in elongation were performed with melts of anionically polymerized polystyrenes (PS) and with their blends at a temperature of 150 °C. For stresses a0 < 10 000 N/m 2 the samples with narrow molecular weight distribution show linear viscoelastic behavior up to the maximum Hencky strain e = 3.5, achievable in a newly developed elongational rheometer for polymer melts. The compliances, D (t), of the blends are linear-viscoelastic only up to a strain limit eL. For strains beyond eL the compliance of each blend depends on the stress a0. For a series of binary blends, prepared from the same components of narrow MWD, the linear-viscoelastic limit eL seems to be independent of the mixing ratio and stress, eL seems to be a function only of the molecular weights of the original components, the blends investigated were made from.

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