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

R. Merkel; J. Simon; H. Ringsdorf; E. Sackmann

doi:doi:10.1051/jp2:1994157

Issue		J. Phys. II France Volume 4, Number 4, April 1994


Page(s)		703 - 713
DOI		https://doi.org/10.1051/jp2:1994157

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)

Abstract
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.