Zimm型粘土計による極限粘度数の速度こう配依存性の測定

概要

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All polymer solutions exhibit more or less non-Newtonian viscosity. This true even at infinite dilution. A number of theories have been published on this problem and they are summarized in a form : [η]=[η]_0 (1-Aβ^2+・・・) (1) β=([η]_0η_sM/N_AkT)G (2) where [η] and [η]_0 show the limiting viscosity number at shear rate G and at zero shear rate, respectively ; A is a factor and varies according to the theories ; β is the generalized (dimensionless) shear rate as defined in equation (2) ; η_s is the viscosity of the solvent ; and other symbols have their usual significance. The theories in general predict that the influence of shear rate increases with the molecular weight and with the solvent power. However, there is an important difference among the theories. Some theories predict that the factor A is a constant, and non-Newtonian viscosities are described as a universal function of β. Some other theories predict that the factor A depends on the solvent power and vanishes atθ-point. There are still some other theories that predict that the factor A also depends on the solvent power but does not vanish even at θ-point. [table]
社団法人日本材料学会の論文
1966-05-15