NMR-STUDY OF THE SHELL DYNAMICS AND IONIZATION STATES OF SODIUM AND LITHIUM-SALTS OF POLY(METHYL METHACRYLATE)-BLOCK-POLY(ACRYLIC ACID) MICELLES IN D2O

H-1, Li-7, and Na-23 NMR spectra and relaxations were measured with Li and Na salts of poly(acrylic acid) (PAAcLi: PAAcNa) and of poly(methy l methacrylate)-block-poly(acrylic acid) (PMMA-PAAcLi. PMMA-PAAcNa) mi celles at 300 Kin D2O at concentrations from 0.5 to 0.005% w/w. The re sults show a close similarity in the dependences of polyacrylic chain mobility in PAAcM and PMMA-PAAcM (M = Pda, Li)on concentration and ind icate that chain stiffness increases with dilution. The analogy of beh avior between free linear polyacrylic chains and those bound to a rigi d micellar core, which cannot be locally diluted, indicates that the c ollective interchain and intermicellar interactions have an important effect on the local state on the level of individual monomeric units.