J. Phys. II France
Volume 4, Numéro 4, April 1994
Page(s) 703 - 713
DOI: 10.1051/jp2:1994157
J. Phys. II France 4 (1994) 703-713

Reaction kinetics in dense two-dimensional polymer solutions : an excimer probe study

R. Merkel1, J. Simon2, H. Ringsdorf2 and E. Sackmann1

1  Physik Department der Technischen Universität München, Biophysics Laboratory, James-Frank-Str. 1, D-85747 Garching, Germany
2  Institüt für Organische Chemie der Universität Mainz, Johannes-Gutenberg-Universität Mainz, J. J. Becher Weg 18-20, D-55128 Mainz, Germany

(Received 27 July 1993, received in final form 22 December 1993, accepted 3 January 1994)

We report measurements of the time dependent reaction rate of excimer formation in two-dimensional solutions of a polymerized amphiphile with partially pyrene-labelled chains in monolayers at the air-water-interface. We find a time dependent reaction rate for excimer formation obeying a power law $r(t) \propto t^{-\beta}$. The exponent $\beta$ has a value of $0.22 \pm 0.12$. This value is consistent with $\beta = 1/4$, as has been predicted for bimolecular diffusion-controlled reactions in two-dimensional polymer melts by de Gennes [1, 2]. The measurements demonstrate the usefulness of the excimer technique to explore polymer dynamics.

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