An encapsulated dumbbell model for concentrated polymer solutions and melts II. Calculation of material functions and experimental comparisons

The consitutive equation derived in Part I 1] is used to compute steady-state and time-dependent material functions. A procedure is suggested for determining the four independent model parameters (λ_H, b, σ, β) from experimental data.Material functions have been calculated using parameters determined by experimental data for concentrated solutions of nearly monodisperse linear polymers. The theoretical curves for steady shear properties (η and Ψ₁) are in quantitative agreement with the data well into the range of nonlinear behavior. The calculated time-dependent properties (η*, η⁺, Ψ⁺, η^?) are in qualitative agreement with observed behavior. Theoretical curves for elongational viscosity are reasonable, but suitable experimental data are not available for comparison.