Dielectric Spectroscopy Combined with High-Temperature Rheology
Dielectric spectroscopy is an investigative technique based on the study of the material response to an applied electric field. It can be used as a complementary technique to rheology, providing additional information on structure and behavior.
The dielectric spectroscopy is a well-established investigation technique based on the study of the material response to an applied electric field. The electrical current flowing through a sample as a response to an alternating electric field is measured as a function of field frequency. The resulting dielectric spectrum provides information on the structure and behavior of the analyzed material in frequency ranges less accessible to mechanical analysis. This might provide additional insight to study phase transitions, e.g. the frequency-dependent glass transition temperature in oscillation, structural changes during deformation, e.g. a possible shear rate or strain rate dependent capacitance of polymers, or the effect of additives on the capacitance.
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