Dielectric properties of polyelectrolytes. I. A study on tetra-n-butyl ammonium polyacrylate

✍ Scribed by Akira Minakata; Nobuhisa Imai

• Publisher: Wiley (John Wiley & Sons)
• Year: 1972
• Tongue: English
• Weight: 872 KB
• Volume: 11
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1972.360110203

✦ Synopsis

Dielectric constant and loss of aqueous solutions of tetra-n-butyl ammonium polyacrylate ((Bu)~NPA) were measured in the frequency range from 300 Hz to 6 MHz as compared with sodium and other salts a t various conditions. Our results show that there are two dispersions observed in the low-frequency range (LFD, several hundreds of Hz to several kHz) and in the high frequency range (HFD, several ten kHz to MHz), respectively, both of which are roughly expressed as the Cole-Cole dispersion formula with Cole parameters about 0.3. The large values of dielectric increment, its aonlinear concentration dependence, and other features suggest that both dispersions are explained by relaxations of two different iohic processes. For HFD, experimental results were qualitatively similar to those have been reported and compared with theories of the Maxwell-Wagner-type effect. On the other hand, LFD may be attributable to the polarization of loosely bound counterions. A model available for LFD was presented on the basis of counterion fluctuation.