Volume 42, Number 3, May I 1998
|Page(s)||271 - 276|
|Section||Condensed matter: structure, thermal and mechanical properties|
|Published online||01 September 2002|
Controlling the dynamics of soft spheres: From polymeric to colloidal behavior
Foundation for Research and Technology-Hellas,
Institute of Electronic Structure and Laser,
P.O. Box 1527, 71110 Heraklion, Crete, Greece
2 Department of Applied Mathematics, University of Leeds, Leeds LS29JT, UK
3 National Research Council, Institute for Environmental Chemistry, Ottawa, Ontario, K1A0R6, Canada
4 Universität Leipzig, Fakultät für Physik und Geowissenschaften, D-04103 Leipzig, Germany
Accepted: 16 March 1998
We probe the dynamic structure factor of multiarm star polymer solutions in good solvent above the overlap concentration with photon correlation spectroscopy and NMR. With the aid of a mean-field theoretical approach, which accounts for the interplay between the topologically enhanced osmotic pressure and the arm entropic stretching, we identify three mechanisms for relaxing the concentration and density fluctuations: cooperative diffusion, self-diffusion and structural relaxation. These model spherical brushes exhibit a behavior intermediate between polymers and colloids.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 61.41.+e – Polymers, elastomers, and plastics / 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion
© EDP Sciences, 1998
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