Volume 51, Number 1, July I 2000
|Page(s)||68 - 74|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Chain trapping in diblock copolymers near the ordering transition
Foundation for Research and Technology - Hellas, Institute of Electronic
Structure and Laser - P.O. Box 1527, 711 10 Heraklion Crete, Greece
2 University of Crete, Physics Department - 711 10 Heraklion Crete, Greece
3 Universität Leipzig, Fakultät für Physik und Geowissenschaften D-04103 Leipzig, Germany
4 University of Leeds, Department of Applied Mathematics - Leeds LS2 9JT, UK
5 University of Athens, Chemistry Department - 157 01 Zografou Athens, Greece o 7.5cmWe dedicate this paper to the memory o 7.5cmof Gerald Fleischer, with whom we o 7.5cmwrote the paper
Accepted: 10 May 2000
The mean-square displacement, , of very high molecular weight diblock copolymers in solutions near the disorder-to-order transition is investigated by pulsed-field-gradient NMR. The thermodynamic potential influencing the motion leads to a time-in de pend ent at short times followed by free-diffusional behavior. The plateau is attributed to a trapping of the copolymer chains at the “quasi-interfaces” formed by slow composition fluctuations.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 64.60.Cn – Order-disorder transformations; statistical mechanics of model systems
© EDP Sciences, 2000
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