Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: POSTERS Polymerphysics

CPP 34.40: Poster

Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A

Solidification of fast crystallizing polymers studied by differential chip nano-calorimetry — •Evgeny Zhuravlev, Saurabh Garg, Andreas Wurm, and Christoph Schick — University of Rostock, Institute of Physics, Universitätsplatz 3, 18051 Rostock, Germany

The device was developed for investigation of thermal processes during fast thermal treatments of nanosized samples. The idea of the device was taken from differential scanning calorimetry. It consists of high sensitive, low addenda heat capacity thin film sensors used as sample and reference measuring cell. Small heated area and sensitive thermopiles allow both controlled fast heating and cooling.

Electrical control circuit was slightly modified in comparison with PerkinElmer power compensated DSC. This solution gives directly changes in heat flow from/to the sample during temperature scans.

The device works in the range of scanning rates between 0.1 and 10000 K/s with nanogram samples. It positioned exactly between existing DSC and ultra-fast scanning techniques.

Scheme, main principles and working of control circuits will be presented. We show first data on In, Sn and Pb. Measurements of supercooling of Sn samples using DSC, differential power compensated fast scanning technique and ultra-fast scanning is discussed. These measurements cover 10 orders of magnitude in scanning rate. Further we present data on isothermal crystallization of iPP and nucleated iPP in a wide temperature and dynamic range.