Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-10-12
Langmuir 16 (2000) 8702-8711
Physics
Condensed Matter
Soft Condensed Matter
mars 2000
Scientific paper
10.1021/la000317c
Step strain experiments and dynamic light scattering measurements are perfomed to characterize the dynamic behavior of an o/w droplet microemulsion into which is incorporated a telechelic polymer. At sufficient droplet and polymer concentrations, above the percolation threshold, the system is viscoelastic and its dynamic structure factor shows up two steps for the relaxation of concentration fluctuations: the fast one is dominated by the diffusion but the slower one is almost independent of the wave vector. The terminal time of the stress relaxation tR and the slow time of the dynamic structure factor tS are both presumably controlled by the residence time of a sticker in a droplet: consistently, tR and tS are of the same order, they both vanishes at the percolation threshold according to power laws but with different exponents. We discuss these features in terms of deviations at the transition, from the usual mean field description of the dynamics of transient networks.
Appell Jacqueline
Aznar Raymond
Filali Mohammed
Michel Eric
Porte Gregoire
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