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Electrolytic conductivity of ionic polymers in a nonpolar solvent
1Department of Chemistry, University of Sheffield, Brook Hill, S3 7HF, Sheffield, South Yorkshire, UK. gregory.smith@nbi.ku.dk.
The European Physical Journal. E, Soft Matter
|August 4, 2020
Summary
Electrolytic conductivity was studied for small molecule and macromolecular electrolytes in n-dodecane. Results explain counterintuitive particle mobility by showing how reduced cationic chains increase single-ion constants and suppress triple-ion formation.
Area of Science:
- Physical Chemistry
- Polymer Science
- Electrochemistry
Background:
- Electrolytic conductivity in nonpolar solvents is crucial for understanding ion transport in complex systems.
- Macromolecular electrolytes offer unique properties compared to small molecule counterparts.
- Previous electrokinetic studies showed counterintuitive particle mobility stabilized by cationic polymers.
Purpose of the Study:
- To investigate the electrolytic conductivity of small molecule and macromolecular electrolytes in n-dodecane.
- To correlate conductivity data with electrokinetic behavior of polymer-stabilized particles.
- To elucidate the ion aggregation behavior (single ions vs. triple ions) in these systems.
Main Methods:
- Electrolytic conductivity measurements as a function of concentration.
- Synthesis of small molecule and two series of macromolecular electrolytes (fully cationic and mixed cationic/nonionic).
- Analysis of conductivity data to determine equilibrium constants for ion formation.
Main Results:
- Conductivity data were qualitatively similar for all studied electrolytes.
- Reduced proportion of cationic chains in macromolecular electrolytes increased the single-ion equilibrium constant.
- Suppression of triple ion formation was observed with decreased cationic chain concentration.
Conclusions:
- The conductivity data provide a basis for understanding the observed electrokinetic phenomena.
- Reduced cationic content in polymer stabilizers enhances particle electrophoretic mobility.
- Ion aggregation equilibria are sensitive to the concentration of charged species in nonpolar solvents.
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