A new equation for estimating [η] from single‐viscosity measurement in dilute solution

The use of a linear two‐parameter approximation for determining limiting viscosity number, [η], of a polymer in the state of infinite dilution requires considerable amount of time, effort, and materials. Several workers who attempted to estimate [η] directly from single‐viscosity measurement also proposed equations for this purpose. Such equations are tested and found to have good applicability to practical data within specified limits of concentration or specific viscosity. A new equation has been derived and tested for polymers of high and low molecular weights in various solvents and at different temperatures. The introduction of a constant in this equation makes it applicable over a wider range of specific viscosity. It is found to serve better for determination of [η] from a single‐viscosity measurement.