| Issue |
Europhys. Lett.
Volume 55, Number 5, September 2001
|
|
|---|---|---|
| Page(s) | 667 - 673 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00467-y | |
| Published online | 01 December 2003 | |
Time-resolved SANS for the determination of unimer exchange kinetics in block copolymer micelles
Institut für Festkörperforschung, Forschungszentrum Jülich - 52425 Jülich, Germany
Received:
19
February
2001
Accepted:
21
June
2001
A time-resolved SANS method was developed for the determination of
unimer exchange kinetics of polymeric micelles under equilibrium
conditions. Measurements were performed on the system PEP-PEO/DMF
exploiting the large difference in scattering length density of
protonated and deuterated species. In contrast to theoretical
predictions the observed kinetics consists of two well-separated
processes. From temperature-dependent measurements the corresponding
activation energies 
could be determined. A comparison on the
basis of a scaling prediction of Halperin and Alexander indicates that
the fast process can be associated with a single unimer
insertion/expulsion mechanism. The slow process, on the other hand,
could not be explained on the basis of available microscopic models.
PACS: 61.12.Ex – Neutron scattering techniques (including small-angle scattering) / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling
© EDP Sciences, 2001
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