Logo JG-Universität MainzProf. Dr. Axel Müller


314. Bolisetty, S.; Rosenfeldt, S.; Rochette, C.; Harnau, L.; Lindner, P.; Xu, Y.; Müller, A.H.E.; Ballauff, M.: Interaction of cylindrical polymer brushes in dilute and semi-dilute solution, Colloid Polym. Sci. 287, 129 (2009) -- DOI: 10.1007/s00396-008-1962-3 -- PDF
Key words: Cylindrical polymer brushes, Softening of polymers, SANS, DLS, PRISM

We present a systematic study of flexible cylindrical brush-shaped macromolecules in a good solvent by small angle neutron scattering (SANS), static light scattering (SLS) and by dynamic light scattering (DLS) in dilute and semi-dilute solution. The SLS and SANS-data extrapolated to infinite dilution lead to the shape of the polymer that can be modeled in terms of a worm-like chain with a contour length of 380 nm and a persistence length of 17.5 nm. SANS data taken at higher polymer concentration were evaluated by using the polymer reference interaction site model (PRISM). We find that the persistence length reduce from 17.5 nm at infinite dilution to 5.3 nm at the highest concentration (40.6 g/L). This is comparable with the decrease of the persistence length in semi-dilute concentration predicted theoretically for polyelectrolytes. This finding reveals a softening of stiffness of the polymer brushes caused by their mutual interaction.

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Related links:
  • Project: SFB 481 TP A12: Structure Formation and Phase Equilibria in Concentrated Solutions of Charged Starpolymers
  • Project: SFB 481 TP B9: Hybrid Systems with Magnetic Nanoparticles

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