抄録
The change in the Na+ ion binding properties of a series of the anions of inorganic phosphates (phosphinate, cyclic polyphosphate, and linear polyphosphate) has been studied in order to see the transition from simple electrolyte to polyelectrolyte. Na+ ion activity measurement together with 23Na NMR peak width measurement gave a consistent conclusion that about 100 of the chain-length is needed to show the binding properties independent of the chain-length in salt-free system.
