Theory of Viscoelasticity in Temporarily Crosslinked Polymers : VI Semiphenomenological Extension and Non-Newtonian Viscosity

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The viscoelastic behavior of concentrated polymer solutions is studied by using the network model composed of the Rouse chains. Rheological equation is obtained as follows [numerical formula] where τ_α and τ_β are the shortest and the longest relaxation times, n expresses the length of molecule, α and β are the parameters characterizing elastic and viscous interactions. Relaxation spectrum, viscosity and normal stress are obtained from the rheological equation. If tight crosslinks exist in the extremely high molecular weight region, the slope of log η-log M relation is to be larger than 3.4 in this region. When the parameter characterizing the viscous interaction in non-Newtonian flow is estimated qualitatively, four types of the viscosity versus molecular weight relation are predicted. Two of them have already been reported in works of Porter et al. and of Ozaki et al.
社団法人日本物理学会の論文
1967-11-05