Berlin 2001 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 19: Poster: New Methods, Thin Polymer Films, Monolayers
CPP 19.33: Poster
Thursday, April 5, 2001, 12:30–15:00, AT1
Molecular dynamics of polymers in nanometer confinements in dependence of the structure of the polymer chain — •Andreas Schoenhals1, Harald Goering1, and Christoph Schick2 — 1Bundesanstalt fuer Materialforschung und -pruefung, Unter den Eichen 87, 12205 Berlin — 2Universitaet Rostock, Fachbereich Physik, Universitaetsplatz 3, D-18051 Rostock
Dielectric spectroscopy and temperature modulated DSC experiments are employed to study the molecular dynamics of oligomeric poly(propylene) glycol (PPG) and poly(dimethyl siloxane) (PDMS) melts confined to nanoporous glasses (pore sizes 2.5, 5.0, 7.5 and 20 nm). The relaxation times obtained by both methods correlate directly to each other. The change of the temperature dependence of the relaxation times compared to bulk state depends on the pore size. Moreover a length scale as lower bound for the glass transition is estimated in the range from 1.5 nm to 5 nm depending on the structure of the investigated polymer