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Nihon Reoroji Gakkaishi
Differential constitutive equations for entangled polymer systems are evaluated experimentally. Applicability of three constitutive models proposed by Leonov, Giesekus and Larson, respectively, is investigated based on stress relaxation data for polystyrene melts. Predictions of these three models on strain-dependent relaxation modulus G (t, γ) are comparcd with experimental data obtaincd for samples with narrow and bimodal molecular weight distributions. It is found from the comparison thatdoi:10.1678/rheology1973.18.1_18 fatcat:seduugomcjg2nm3e6rmntef56e