Dielectric behavior of aqueous solutions of sodium carboxymethyl cellulose

Abstract

Measurements are reported for the dielectric loss factor of the SCMC solutions over the frequency range 2 MHz to 50 MHz as a function of concentration of SCMC, concentration of added sodium chloride, molecular weight, and temperature. The results are in general agreement with those of other workers and are interpreted in terms of ionic theories in which motion of the diffuse counterions is the dominant feature.

Relaxational behavior of birefringence of aqueous carboxymethylcellulose under an alternating electric field at frequencies ranging from 0.1 Hz to 100 kHz

“…Allen et al [13] proposed motion of counterions in the ionic atmosphere around polyelectrolyte molecule as the origin of the HF relaxation, but this mechanism seems to be difficult to explain the negative value of Aa E.…”

“…Allg6n and Roswall [11,12] and later Allen et al [13] observed a dielectric relaxation of aqueous CMC at 0.3 to 20 MHz. Their results suggest that our constant part of An at 100 kHz may relax with further increase of frequency above 100 kHz, which is denoted relaxation A in the following.…”

“…According to the dielectric studies by Allg~n and Roswall [11] and Allen et al [13], the relaxational frequency fA is rather insensitive to molecular weight and increases with increasing Cp and Cs. Our results indicate that the relaxation strength 6(An)A levels off with increasing Cp.…”