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Solution viscosity behavior of polystyrene‐based cationic ionomers. Effects of ion content and solvent by Noritaka Ohtani; Yukihiko Inoue; Hiroshi Mizuoka; Kenya Itoh is a Materials Science article available to read on EtoBox.

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## Abstract Dilute‐solution viscosities of polystyrene‐based cationic ionomers containing ammonio or phosphonio groups were measured in several solvents. In polar solvents with dielectric constant (ε~r~) beyond 10, the ionomers showed a typical polyelectrolyte behavior, indicating that a large part of ionic groups were dissociated into ions. In nonpolar solvents with low ε~r~, the reduced viscosity of the ionomers linearly decreased with a decreasing ionomer concentration. At low polymer concentrations, every ionomer gave a reduced viscosity lower than that of the corresponding chloromethylated polystyrene. With an increasing ion content, the intrinsic viscosity progressively decreased if the nonpolar solvents had a low acceptor number (A~N~), such as toluene or tetrahydrofran (THF). In the halogenated solvents with high A~N~ value, such as chloroform, however, the intrinsic viscosity was hardly dependent on the ion content. This indicates that the intramolecular aggregation among the ionic groups is inhibited in the halogenated solvents due to a strong anion solvation. An addition of a protic solvent to a nonpolar solvent eliminates the aggregation between ionic groups and leads t

Who reads Solution viscosity behavior of polystyrene‐based cationic ionomers. Effects of ion content and solvent?

Author

Noritaka Ohtani; Yukihiko Inoue; Hiroshi Mizuoka; Kenya Itoh

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-624X)

Published

1994

Language

EN

Field

Materials Science (Physical Sciences)