Regensburg 2004 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 15: POSTER: Polymers and Biomaterials
CPP 15.3: Poster
Tuesday, March 9, 2004, 17:00–19:00, B
Elastic and Thermal Properties of Nano-Particle Composites within Polymer Matrices — •Andrä le Coutre1,2, Bernd Wetzel3, Jörg Baller1,2, Ravi Bactavatchalou1,2, Ulrich Müller1,2, and Jan K. Krüger1,2 — 1Laboratoire Européen de Recherche Universitaire Saarland-Lorraine (LERUSL) — 2Universität des Saarlandes, Fakultät für Physik und Elektrotechnik 7.2, Geb. 38, Saarbrücken, Germany — 3Universität Kaiserslautern, Institut für Verbundwerkstoffe GmbH, Germany
Composite systems gain importance in material science as well as in industrial applications. One aim is the improvement of the mechanical properties by reinforcement of polymer matrices with particles or fibers. By means of Brillouin spectroscopy we investigated the effective elastic modulus (compressional and shear modulus) of DGEBA/DETA-epoxies filled with Al2O3 and SiO2 nanoparticles with sizes below 50 nm. In addition to the stiffening as expected by averaging models of elastic properties, an enhanced stiffness for particle concentrations below 6% volume fraction is observed. The reason for this is assumed either to be an effect of a special chemical affinity of the hardening component (DETA) to the nanoparticle surface or a structurizing effect of the surface on the surrounding epoxy matrix. As a kind of inverse situation DGEBA-filled nanoporous glass matrices were investigated giving hints for a structurizing effect of the inner surfaces to the DGEBA molecules.