Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Polymer Physics I

CPP 2.5: Talk

Monday, March 26, 2007, 11:15–11:30, H40

Structure Property Relationships of Polymeric Nanocomposites based on Polyhedral Oligomeric Silsesquioxanes — Ning Hao, Martin Boehning, and •Andreas Schönhals — Federal Institute of Materials Reserach and Testing (BAM), Unter den Eichen 87, D-12205 Berlin

Polymer based nanocomposites continue to receive tremendous attention for different applications. They show remarkable property improvement (increased tensile properties, decreased gas permeability, decreased solvent uptake, increased thermal stability and flame retardance) when compared to conventionally scaled composites.Different polymer based nanocomposites are prepared where, polycarbonate and polystyrene are used as polymer matrices. As molecular nanofillers polyhedral oligomeric silsesquioxanes (POSS) with different substituents (Phenethyl-, Chlorpropyl-) are used. The property structure relationships of these nanocomposites are investigated by dielectric spectroscopy, gas transport measurements (permeation, sorption) and density measurements as well. The results are discussed with regard to the phase structure of the nanocomposites and the properties of the different POSS. This includes the construction of phase diagrams. Especial attention is paid to characterize the interfacial region between the polymeric matrix and nanoparticles. This regards also to estimate the length scale of interaction between the nanoparticle and the matrix.