Berlin 2001 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 16: Poster: Dynamics of Molecular Systems, Polymer Dynamics, Glass Transition, Crystallization, Electronic Properties of Polymers

CPP 16.18: Poster

Monday, April 2, 2001, 12:30–15:00, AT1

Simultaneous measurements of complex heat capacity and complex thermal conductivity by two-channel AC calorimeter — •Sergey Adamovsky¹, Alexander Minakov², Mikhail Merzliakov¹, and Christoph Schick¹ — ¹University of Rostock, Dept. of Physics, Universitaetsplatz 3, 18051 Rostock, Germany — ²General Physics Institute, R.A.S., Vavilov st. 38, 117942 Moscow, Russia

The new capabilities of the advanced two-channel AC calorimetry, when working at frequencies above quasi-static limit, were shown. The idea of the method was to use the information about the phases and the amplitudes of the temperature oscillations on both sides of a plate-like sample for direct simultaneous determination of the complex heat capacity and the complex thermal conductivity, when the thermal oscillations were measured on both sides of the sample. Therefore, the complete set of the complex thermal parameters can be measured in the same experiment. The method provides a possibility to answer the fundamental question about the value of imaginary part of the complex thermal conductivity. It was found, that the argument of the complex thermal conductivity is considerably small with respect to that of the complex heat capacity. Thus, at least within the error of the experiment the thermal conductivity at glass transition in glycerol can be considered as a real valued parameter. In spite of the strong frequency dependence of the complex heat capacity, no frequency dependency of the thermal conductivity was observed.