Dielectric thermal analysis (DETA), or dielectric analysis (DEA), is a materials science technique similar to dynamic mechanical analysis except that an oscillating electrical field is used instead of a mechanical force.[1] For investigation of the curing behavior of thermosetting resin systems, composite materials, adhesives and paints, Dielectric Analysis (DEA) can be used in accordance with ASTM E 2038 or E 2039. The great advantage of DEA is that it can be employed not only on a laboratory scale, but also in process.
In a typical test, the sample is placed in contact with two electrodes (the dielectric sensor) and a sinusoidal voltage (the excitation) is applied to one electrode.[2] The resulting sinusoidal current (the response) is measured at the second electrode. The response signal is attenuated in amplitude and shifted in phase in relation to the mobility of the ions and alignment of the dipoles. Dipoles in the material will attempt to align with the electric field and ions (present as impurities) will move toward the electrode of opposite polarity. The dielectric properties of permittivity ε' and loss factor ε" are then calculated from this measured amplitude and phase change.[2]
Referencesedit
^Haines, Peter J. (2002). Thermal Analysis and Calorimetry. Royal Society of Chemistry. ISBN9780854046102.
^ abBrown, M. E. (2001-12-31). Introduction to Thermal Analysis: Techniques and Applications. Springer. ISBN9781402004728.
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dielectric, thermal, analysis, deta, dielectric, analysis, materials, science, technique, similar, dynamic, mechanical, analysis, except, that, oscillating, electrical, field, used, instead, mechanical, force, investigation, curing, behavior, thermosetting, re. Dielectric thermal analysis DETA or dielectric analysis DEA is a materials science technique similar to dynamic mechanical analysis except that an oscillating electrical field is used instead of a mechanical force 1 For investigation of the curing behavior of thermosetting resin systems composite materials adhesives and paints Dielectric Analysis DEA can be used in accordance with ASTM E 2038 or E 2039 The great advantage of DEA is that it can be employed not only on a laboratory scale but also in process Dielectric thermal analysisAcronymDETA DEAClassificationThermal analysisOther techniquesRelatedIsothermal titration calorimetryDynamic mechanical analysisThermomechanical analysisThermogravimetric analysisDifferential thermal analysisDielectric thermal analysisMeasuring principle editIn a typical test the sample is placed in contact with two electrodes the dielectric sensor and a sinusoidal voltage the excitation is applied to one electrode 2 The resulting sinusoidal current the response is measured at the second electrode The response signal is attenuated in amplitude and shifted in phase in relation to the mobility of the ions and alignment of the dipoles Dipoles in the material will attempt to align with the electric field and ions present as impurities will move toward the electrode of opposite polarity The dielectric properties of permittivity e and loss factor e are then calculated from this measured amplitude and phase change 2 References edit Haines Peter J 2002 Thermal Analysis and Calorimetry Royal Society of Chemistry ISBN 9780854046102 a b Brown M E 2001 12 31 Introduction to Thermal Analysis Techniques and Applications Springer ISBN 9781402004728 nbsp This article about materials science is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Dielectric thermal analysis amp oldid 1192867605, wikipedia, wiki, book, books, library,
