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- W2095331617 startingPage "2188" @default.
- W2095331617 abstract "A theory based on an equivalent rigid ellipsoid model is presented to explain the shear gradient dependence of intrinsic viscosity of polymers such as polystyrene. An ensemble of independent coiled polymers in a dilute solution, at a (varTheta) temperature, is assumed to be replaced by that of hydrodynamically equivalent rigid ellipsoids with various dimensions. For each ellipsoid, one makes use of results of Saito's and Scheraga's theories for the non-Newtonian viscosity of ellipsoidal particles. Ratios of the intrinsic viscosity at gradients G to that at zero-gradient are numerically computed as a function of (1.47/ k T ) (< L 2 > 0 / M ) 3/2 M 3/2 η 0 G , without the aid of any other ajustable parameters. Here M is the molecular weight of the polymer, < L 2 > 0 is its mean square end-to-end distance in an unperturbed state, and η 0 is the viscosity of the solvent. The result is compared with other theories and with experiments made near (varTheta) temperatures. An agreement between theory and data on viscosity of monodisperse polystyrene by Passaglia et al. is satisfactory." @default.
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- W2095331617 date "1964-11-01" @default.
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- W2095331617 title "Non-Newtonian Intrinsic Viscosity of Coiled Polymers at a Theta Temperature" @default.
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- W2095331617 doi "https://doi.org/10.1143/jpsj.19.2188" @default.
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