| Issue |
Europhys. Lett.
Volume 42, Number 3, May I 1998
|
|
|---|---|---|
| Page(s) | 271 - 276 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00241-3 | |
| Published online | 01 September 2002 | |
Controlling the dynamics of soft spheres: From polymeric to colloidal behavior
1
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
Received:
8
December
1997
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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