THE EVALUATION OF THE INTRINSIC VISCOSITY (AS INTRINSIC FLOW TIME) OF GR-S IN BENZENE

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Abstract
From careful measurements of the relative flow times of solutions of GR-S in benzene, it has been established that the intrinsic flow time (and hence the intrinsic viscosity) of GR-S in benzene may be most precisely determined by the use of a function [Formula: see text], based on the Baker equation relating ηr, the relative viscosity, and c, the concentration; for the GR-S–benzene system the value of n may be taken as 8. For the greatest precision [t] is determined by linear (horizontal) extrapolation, to zero concentration, of the [Formula: see text] vs. c plot; in rapid routine work [t] may be evaluated as [Formula: see text] by measurements on only one solution of a concentration such that tr = 1.8 ± 0.4.

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