The role of intra- and intermolecular interactions on solution properties of sulfonated polystyrene ionomers was studied in a low-polarity and a polar solvent by viscosity measurements. In a low-polarity solvent (tetrahydrofuran (THF)), the ionomer that had a large number of ionic groups per chain (40–200) showed dominant intramolecular interaction at very dilute concentration and dominant intermolecular interaction at high concentration. However, the ionomer that had a small number of ionic groups per chain (1–3) showed almost no intramolecular interaction at dilute concentration and small degree of intermolecular interaction at high concentration. In a polar solvent (dimethylformamide (DMF)), even the ionomer with a very small number of ionic groups per chain (e.g., 1 on average) showed typical polyelectrolyte behavior. These experimental results suggest the important role of intermolecular interaction in the viscosity behavior of salt-free polyelectrolytes even in low-concentration solutions.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry