J. Phys. II France
Volume 2, Numéro 8, August 1992
Page(s) 1495 - 1503
DOI: 10.1051/jp2:1992216
J. Phys. II France 2 (1992) 1495-1503

Local dynamics of cross-linked polymer chains

A. Lapp1, T. Csiba2, B. Farago3 and M. Daoud1

1  Laboratoire Léon Brillouin (C.E.A.-C.N.R.S.) C.E.N. Saclay, 91191 Gif/Yvette cedex, France
2  Central Research Institute for Physics, P.O. Box 49, 1525 Budapest, Hongrie
3  Institut Laue Langevin, 156 X Centre de tri, 38042 Grenoble cedex, France

(Received 24 March 1992, accepted in final form 18 June 1992)

We report neutron spin echo measurements of the dynamic correlation function of cross-linked polydimethylsiloxane disolved in toluene. The experiments were performed on semi-dilute solutions. The main result is that at the frequencies probed by the spectrometer, there is no difference between the dynamics of cross-linked and uncrosslinked polymers. The dynamics is Zimm like and includes hydrodynamic interactions. Using a reduced time variable, it is possible to plot all the experimental data for both concentrations we studied on the same mastercurve. Moreover, previous results by Csiba et al. on uncross-linked PDMS are also located on the same curve. This shows that cross-linking has no dramatic effect on the local dynamics of the linear chains.


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