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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Polymer Physics I

CPP 2.4: Vortrag

Montag, 26. März 2007, 11:00–11:15, H40

Thermal and chemical glass transition of two nanocomposite systems — Roland Sanctuary, •Jörg Baller, Ravi Bactavatchalou, Jan Kristian Krüger, Bartosz Zielinski, and Martine Philipp — Université du Luxembourg, Laboratory of Physics of Condensed Matter and Advanced Materials (LPM), 162a, avenue de la Faïencerie, L-1511 Luxembourg

Epoxy resins modified with different kind of nanoparticles, so-called nanocomposites, reveal properties which are interesting from the fundamental and technical point of view. E.g. nanoparticles of Al2O3 strongly increase the viscosity of the composites which leads to a modified glass transition behaviour: Tg as well as the distribution of relaxation time is changed as a function of nanoparticle content. However surface-treated SiO2 particles almost have no effect. Addition of a suited hardener to these nanocomposites leads to reactive adhesive systems. These systems undergo a chemical glass transition during the curing process. Despite of the big difference in viscosity between the epoxy resins filled with Al2O3 and SiO2 particles, curing of these systems doesn't seem to be sensitive to the type of filler particles. Moreover the kinetics of the chemical reaction is faster compared to systems without nanoparticles. Concerning the thermal glass transition, the influence of filler particles is completely different for the epoxy resin and the cured system (e.g. opposite shift of Tg). MDSC, Brillouin spectroscopy and rheology data is presented and discussed for these systems before, during and after chemical curing.