Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 371106
Title Modeling of triblock terpolymer micelles with a segregated corona
Author(s) Charlaganov, M.; Borisov, O.V.; Leermakers, F.A.M.
Source Macromolecules 41 (2008)10. - ISSN 0024-9297 - p. 3668 - 3677.
Department(s) Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2008
Keyword(s) nonionic surfactants - interfacial-tension - block-copolymers - janus micelles - adsorbed layer - adsorption - polymers - surfaces - micellization - polystyrene
Abstract We report on self-consistent field predictions for the formation of spherical micelles by ANBMCN triblock terpolymers in a selective solvent, that is, a good solvent for the AN and CN blocks and a poor solvent for the middle BM block. Above some threshold value for the repulsion between the A and C monomers, we find micelles with a laterally segregated corona, that is, Janus micelles. We consider the thermodynamic stability, the size, and the size fluctuations of these micelles. The transition between the homogeneous and the segregated states is smooth not only because of the finite size of the system, but also due to the compositional symmetry within the triblock terpolymer. It is found that the aggregation number decreases with increasing repulsion between A and C below the transition point and increases above the transition point. The formation of the interface is triggered by the high polymer density near the core. The interface between the A and C rich regions occupies a constant angle in spherical coordinates. This means that it widens in the radial direction. In these micelles, the lateral segregation gives a new fluctuation mode to the micelles; as the lateral segregation is coupled to the aggregation number, we anticipate a rich behavior in experimental systems.
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