Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Polymer Physics I

CPP 10.2: Vortrag

Montag, 23. März 2009, 18:15–18:30, ZEU 114

Molecular acoustic studies around the boundary between network-forming reactive liquids — •Roland Sanctuary, Martine Philipp, Jörg Baller, Bartosz Zielinski, Ulrich Müller, and Jan Kristian Krüger — Université du Luxembourg, Laboratory of Physics of Condensed Matter and Advanced Materials (LPM), 162a, avenue de la Faïencerie, L-1511 Luxembourg

Scanning Brillouin microscopy is used to investigate chemical reactions and molecular transport processes around the interface between the layered reactive constituents of epoxies. The temporal evolution of the spatial hypersonic landscape behaves significantly asymmetric along the resin and hardener rich region and is attributed to a complicated superposition of polymerization, transport, dissolution and molecular disintegration phenomena. The temporal and spatial distributions of the sound velocity in the hardener and resin rich zones of the samples seem to show chaotic behavior. If in addition alumina nanoparticles are initially present in the resin, interfacial polymerization changes its character in comparison to the system involving the pure resin. According to the hypersonic behavior the penetration of the hardener in the filled resin seems to be hindered by the presence of the nanoparticles. In turn, once the alumina nanoparticles have entered the hardener rich region, they seem to develop a catalytic influence on the epoxy polymerization.