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pps proceeding
Symposium: S10 - Reactive Processing
Oral Presentation
 
 

From the rheology of an uncured epoxy resin to the dynamic mechanical analysis of the cured component

Rodríguez Agudo José Alberto (1), Walluch Matthias (2)*

(1) Anton Paar Germany - Ostfildern - Germany, (2) Anton Paar GmbH - Graz - Austria

The kinetics of an epoxy resin and the thermo-mechanical properties of the finally cross-linked product were experimentally studied using a MCR MultiDrive rheometer. In order to better understand how the macroscopical properties evolve due to chemical changes in the molecular structure of the sample, the rheological measurements were combined with Raman spectroscopy. The gelation-kinetics was further evaluated with a dynamic multiwave test. Accordingly, the Winter-Chambon criterion was used to determine the sol/gel transition point. For DMA of the cured component the rheometer was additionally equipped with a linear drive. The combination of linear drive and rotational drive in one device permitted us to measure the dynamic mechanical properties in two different deformation modes (torsion and bending). Additionally to this, it is possible to determine Young’s and shear modulus with a single sample in a continuous measurement run and within a broad range of temperature and frequency. A compensation of rotational torques acting at the linear drive and tensile forces acting at the rotational drive enables precise measurements in all testing modes. Two thermal events could be detected from the DMA test: the main glass transition temperature and a sub-glass transition of the material.