Influence of polyvinylpyrrolidone on the interaction between water and methanol

Brazilian Journal of Chemical Engineering

M. Guettari²  R. Gomati¹ 

[1] ,Université de Tunis Institut Préparatoire aux Etudes d'Ingénieurs de Tunis, Montfleury Tunis Unité de Recherche NMR des Polymères et des Composites,Tunisie

关键词: Viscosity;    Rheology;    Polymer;    Mixed solvents;    Interaction;   

DOI  :  10.1590/S0104-66322013000300024

来源: SciELO

【 摘 要 】

The present work aims to determine the influence of a dissolved polymer, polyvinylpyrrolidone, on the interaction between water and methanol. First, the dynamic viscosities were measured for polymer solutions by a rotational concentric cylinder at 25 ºC and for the polymer concentration range from 0.1 to 0.6 g/dl. The results show a polynomial dependence of the viscosity on polymer concentration. On the hypothesis of a quasi-binary system, a pseudo Grumberg-Nissan constant, d'p, was introduced to quantify the interaction between unlike molecules in the presence of polymer. The interaction between unlike molecules due to the presence of the polymer was quantified by the deviation of the Grumberg-Nissan constant, δd'p= d p. Generally, this constant is negative which means that the interactions between water and methanol decrease in the presence of polyvinylpyrrolidone at 25 ºC. The presence of the polymer induces a perturbation of the dynamic equilibrium between free and complexed molecules

【 授权许可】

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