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Abstract
AbstractThe zero‐shear viscosities of dilute to moderately concentrated cellulose acetate phthalate solutions in DMF were measured at different temperatures and the viscosity data were analyzed in terms of Martin's and Fedor's relationships. The [η] values obtained due to the relationships of Martin and Fedor were found to be in very good agreement. The viscosity‐concentration data were also generalized in terms of reduced variables. The temperature dependence of viscosities was expressed by the Frenkel‐Eiring equation and the free energy of activation (ΔGv), heat of activation (ΔHv), and entropy of activation (ΔSv) of the viscous flow of polymer solutions were calculated. It has been observed that the activation energy for viscous flow increases and the activation entropy decreases with concentration of polymer solutions.
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