Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster: Crystallisation, Nucleation and Self assembly
CPP 17.7: Poster
Dienstag, 27. März 2012, 18:15–20:15, Poster A
Crystallization kinetics of PET/MWCNT nanocomposites — •Andreas Wurm1, Anja Herrmann1, Andreas Korwitz2, Doris Pospiech2, and Christoph Schick1 — 1University of Rostock, Institute of Physics, Wismarsche Str. 43-45, 18057 Rostock — 2Leibniz-Institut für Polymerforschung Dresden e.V., Dept. of Polymer Structures, Hohe Str. 6, 01069 Dresden
Isothermal and non-isothermal crystallization behavior of polymers can be investigated with traditional calorimeters often in a limited temperature region only. This results from the fast crystallization processes on optimal conditions, which appears in most polymers in a few seconds or less. The new chip-based Mettler Flash DSC 1 allows applying heating and cooling rates of several 1000 K/s, which enables for many polymers to follow crystallization in the whole temperature range between glass transition temperature and melting temperature. We applied the new chip calorimeter for the investigation of crystallization kinetics of PET/MWCNT nanocomposites under non-isothermal and isothermal conditions. The MWCNT act as nucleating agents for PET and speed up crystallization at high temperatures, where heterogeneous nucleation dominates, for about one order of magnitude. At low temperatures, where homogeneous nucleation in the polymer itself determines the rate, only small differences are observed, which leads to the conclusion, that polymer chain dynamics is not drastically changed due to presence of MWCNT in the PET matrix.