ISSN:
0021-8995
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
Differential thermal analysis, or DTA, is a technique for determining the properties of materials from the thermodynamic and kinetic points of view. Dielectric measurement is also a powerful tool for probing the structure of materials, but from another direction. Dielectric analysis is a measure of the dipole response within dielectric materials to an applied electric field. This response is controlled by the spatial arrangement and viscoelastic properties of dielectric materials. Dielectric thermal analysis is being increasingly used in research and process control, offering the advantages of being nonobtrusive and easily instrumented and having a broad theoretical basis which can be correlated with results from other methods such as dynamic mechanical relaxation measurements, NMR, neutron relaxation, birefringence, and, of course, DTA. Because of the nonobtrusive nature of dielectric measurement, it can be run concurrently with other analytical techniques without disturbing their results. When dielectric analysis is run concurrently with other methods of analysis such as DTA, we often receive fresh insights and cross-checking on such behavior as polymeric crosslinking, molecular weight increase, and Tg - viscoelastic behavior in general. The results and conclusions drawn for such investigations are described.
Zusätzliches Material:
13 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/app.1972.070160901
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