Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Molecular Dynamics

CPP 37.1: Vortrag

Freitag, 29. Februar 2008, 10:30–10:45, C 230

Investigation of polymer dynamics in acrylnitrile butadiene rubber — •Juliane Fritzsche and Manfred Klüppel — Deutsches Institut für Kautschuktechnologie e.V., Eupener Straße 33, D-30519 Hannover, Germany

The field of application of elastomers is determined by their frequency dependent dielectric and dynamic-mechanical properties. The dynamic spectrum of such materials becomes very important for understanding the correlation between parameters of the molecular and supramolecular structure on one hand and macroscopic properties on the other.

The frequency dependent mechanical behaviour is obtained by dynamic-mechanical analysis (DMA) and dielectric spectroscopy. Dielectric broadband relaxation spectroscopy covers a frequency range between 10-1 and 109 Hz. In this range molecular and collective dipolar fluctuations, charge transport and polarization effects at inner and outer boundaries take place and determine the dielectric properties of the material. However, molecular and collective dipolar fluctuations are related to characteristic parts of a molecule (functional group) or the molecule as a whole and give raise to characteristic relaxation processes. The investigation of these processes is one of the most important applications of this method as information about the polymer dynamics can be obtained.

In this presentation we will show the investigation of a acrylnitrile butadiene rubber unfilled and filled with different loadings of silica and carbon black. We obtained the dynamic-mechanical behaviour and the dielectric properties in a wide frequency range.