A Heuristic Study on Normal Stress Difference in Oscillatory Shear for Permanent and Temporary Networks of Polymer Chains

概要

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Viscoelastic liquid behaves like elastic solid at frequencies higher than its relaxation times. The storage modulus, G(ω), becomes independent of the angular frequency, ω, and the loss modulus, G"(ω), becomes much smaller than G(ω). On the other hand, the behavior of the first normal stress difference, N1(ω), is quite different from that of elastic solid. In particular, it is always non-zero in contrast with that for solid. We examine the origin of difference based on the concepts of permanent and temporary networks of polymer chain. It is shown that the difference is detected only with experiments of long duration, longer than the maximum relaxation time of the system.
一般社団法人　日本レオロジー学会の論文
1999-06-15