Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: POSTERS Polymerphysics
CPP 34.39: Poster
Thursday, February 28, 2008, 17:00–19:30, Poster A
Immobilized fraction in crystallizable polymer nanocomposites. — •Mohamed Ismail1, Andreas Wurm1, Bernd Kretzschmar2, Doris Pospiech2, and Christoph Schick1 — 1University of Rostock, Institute of Physics, Universitätsplatz 3, 18051 Rostock, Germany — 2Leibniz Institute of Polymer Research Dresden, P. O. Box 120 411, 01005 Dresden, Germany
In this contribution we demonstrate the crystallization behavior of PA 6.6 filled with different concentrations of nanoparticles (Nanofil 919) to provide a wide range of systems with different mobility. We used a temperature modulated DSC (TMDSC) technique to determine heat capacity at the glass transition of the polymer. The existence of an immobilized fraction in PA / Nanofil 919 nanocomposites was shown. We obtained crystalline fraction, C, immobilized fraction, RAF, and the mobile amorphous fraction, MA for the whole sample series. The remaining mobile amorphous fraction of the polymer part, determined from step height at glass transition *cp, seems to be independent on filler content. Also, a slight decrease in Tg was found for more than 29.2 wt.% nanoparticles. For composites with less than 29.2 wt.% nanoparticles, the Tg is independent on filler content. By annealing experiments at and below the glass transition these results were verified.