Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster: Rheology (joint focus with DRG)

CPP 37.3: Poster

Donnerstag, 29. März 2012, 18:45–19:45, Poster A

Complex rheological behavior of epoxy resin based nanocomposites — •Matthieu Thomassey, Jörg Baller, Jan-Kristian Krüger, and Roland Sanctuary — Laboratory of Physics of Condensed Matter and Advanced Materials, University of Luxembourg, 162A, Avenue de la Faïencerie, L-1511 Luxembourg

Rheology is a well-suited tool to reveal flow-induced structural changes in complex soft matter systems. The knowledge of these structural changes is essential to ensure an efficient processing of numerous composites materials. Furthermore it is highly interesting with regards to the fundamental understanding of the mechanisms underlying the structural formation. This contribution presents a detailed rheological study of an oligomer epoxy resin (diglycidylether of bisphenol A) filled either with hydrophilic alumina or hydrophobic silica nanoparticles. For both systems steady-shear viscosity measurements reveal shear-thinning and subsequently shear-thickening behavior when the shear rate increases. Despite similar flow behaviors of both nanocomposites their transient responses at given shear rates are different. Results are discussed in terms of geometry of nanoparticles, particle-particle interactions and interactions between nanoparticles and matrix molecules.