Electrical conductivity behavior of poly(ethylene oxide) in aqueous electrolyte solutions

Abstract

The electrical conductivity of poly(ethy1ene oxide) of different molecular weights in 0.1 M KCl electrolyte solution has been measured in the temperature interval from 0 to 55 "C. The data have been interpreted on the basis of the Looyenga equation for heterogeneous systems, found to apply with good approximation also for other transport properties. The hydration number deduced from these measurements has been estimated to be lower than that reported elsewhere. Its dependence on temperature, however, supports the occurrence of a cloud point temperature which agrees with the values observed in similar systems. These findings are consistent with the measured activation enthalpy values, which are very similar to that of the pure solvent, indicating that poly(ethy1ene oxide)-water interactions give rise to a structure that would form a rather open hydrogen-bonded network.

Microviscosity of hydrophobically modified hydroxyethyl cellulose aqueous solutions

“…Within the NaCl concentration range (1-17 mM) investigated, the electric conductivity is found to be linear, following Kohlrausch's law Previous studies [3,4,11,12] found that the PEG effect on the electric conductivity depends mainly on the PEG mass concentration, but very weakly on its molecular weight. Wang and Tsao [3] reported a simple exponential function in both dilute and semidilute regimes,…”

High internal phase CO2-in-water emulsions stabilized with a branched nonionic hydrocarbon surfactant

“…11 shows the measured conductivity along with the predicted reduced conductivity using the Maxwell, Bruggeman, and Meredith and Tobias relations. The Maxwell relation for noninteracting spheres of uniform diameter with conductivity σ d in an external medium with conductivity σ m , is [69] Fig. 11.…”

Distinct Diffusion in Macromolecule‐Solvent Mixtures

“…[15] Indeed PEG-PEG interaction, mediated by water, is assumed to be driven by cooperative interaction. [14,17] Before comparing the real DDCs with the novel standards, we compare the behavior of the different standards of literature with the novel one. Since FM-and KB-standards are defined in a mass-fixed reference frame it is not quantitatively comparable to our novel standard.…”

“…In fact the exclusion mechanism, responsible for the phase separation of the protein, is different if the PEG molecules are distinct or associated each other. The PEG aggregation and the network formation at high concentration [14,17] make the exclusion efficiency lower. This should be a new key for interpreting the molecular mechanism of the protein-PEG interaction.…”