Poly(methyl methacrylate)-bloch-poly(acrylic acid) copolymers (PMMA-PAAc) neutralized to various degrees with Li, Na, or K counterions were synthesized and their micellar solutions in D2O were studied using H-1 and Li-7 NMR and SANS. The micelles solubilize organic substances such as chloroform or chlorobenzene under swelling of their PMMA cores with a kinetics controlled mainly by the interaction parameter between the solubilizate and PMMA. The solubilizate is shown to be mainly distributed in the inner area of the micellar corona in the early stages of the solubilization process, later both in the micellar core and along the chains of the corona, in particular in the case of PMMA-PAAc micelles in their acid form. By neutralizing the PAAc chains to various degrees and observing both the NMR spectra and the longitudinal relaxation rate of H-1 and Li-7, changes of conformation and mobility of the PAAc chains can be deduced. With increasing neutralization degree, the solubilization is accelerated but the equilibrium degree of solubilization is slightly lower. The solubilizate transport between PMMA-PAAc and polystyrene-bloch-poly(methacrylic acid) (PS-PMAc) in their sodium forms is demonstrated, showing solubilization selectivity.