|276. Burkhardt, M.; Martinez-Castro, N.; Pfaff, S.; Drechsler, M.; Babin, I.A.; Grishagin, I.V.; Schweins, R.; Pergushov, D.V.; Gradzielski, M.; Zezin, A.B.; Müller, A.H.E.: Polyisobutylene-block-poly(methacrylic acid) Diblock Copolymers: Self-Assembly in Aqueous Media, Langmuir 23, 12864 (2007)|
Ionic amphiphilic diblock copolymers, polyisobutylene-block-poly(methacrylic acid) (PIBx-b-PMAAy) with various lengths of non-polar (X = 25 - 75) and polyelectrolyte (Y = 170 - 2600) blocks spontaneously dissolve in aqueous media at pH > 4, generating macromolecular assemblies, the aggregation number of which depends on external stimuli (pH, ionic strength). The spherical micellar morphology with a compact core formed by the PIB blocks and a swollen corona built up from the PMAA blocks was deduced by cryogenic transmission electron microscopy. The micelles were further characterized by means of dynamic and static light scattering as well as small angle neutron scattering. The critical micellization concentration, estimated by means of fluorescence spectroscopy with the use of pyrene as a polarity probe, is decisively determined by the length of the PIB block and insensitive to changes in the length of the PMAA block.
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