NOVEL-APPROACH TO VISCOMETRIC PARAMETERS OF POLYMER-SOLUTIONS

A three‐parameter equation is put forward to evaluate the [η] of polymer solution from a wide range of concentrations, up to a relative viscosity of 100. The equation is tested by viscometric data of polystyrene, poly(vinyl chloride), poly(1‐vinylnaphthalene), poly(2‐vinylnaphthalene), and poly(4‐vinylbiphenyl) at different temperatures and in a variety of solvents including mixed solvents. A statistical method is employed to analyze the experimental data. It is found that the values of [η] obtained by the new equation are consistently lower than those derived from the Huggins equation. However, the discrepancy is not more than 3% on average, and it does not affect the values of Mark‐Houwink constants significantly. Other parameters of the equation are also computed. Copyright © 1979 John Wiley & Sons, Inc.