Polymer and Materials Science
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
By measuring the capacity change of ethyl cellulose in n-butyl acetate solutions and determining the frequency at which the dielectric dispersion is 0.50, the same general dependence of the intrinsic viscosity on the critical frequency was found as has already been reported for solutions in other solvents. The difficulty in measuring capacities for solutions of high dissipation factor could be overcome either by using a special resistance network with the bridge, or by inserting large values of capacity in parallel with the bridge arms. The latter procedure appears to offer possibilities for use with solvents of still higher dielectric constant and is being investigated at present in this laboratory.
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