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Author
McCarter, R. J.
Title
New Technique for Thermal Analysis of Vapor-Producing Reactions.
Coporate
National Bureau of Standards, Gaithersburg, MD
Journal
Journal of Applied Polymer Science, Vol. 17, 1833-1846, 1973
Keywords
thermal analysis | kinetics | vapor rate | thermal degradation | velocity | reaction rate
Abstract
An apparatus was developed for measuring the rate at which vapors are evolved during the thermal degradation of materials and thereby deriving the kinetics of such reactions. Requisite to the operating scheme of the apparatus is the provision of a high-temperature zone to convert condensable or tarry vapors into noncondensable form. The apparatus yields a direct measure of reaction velocity, rather than the integrated indication obtained with thermogravimetric analysis. This simplifies the identification and calculation of kinetic parameters. Increases in sensitivity and operating range are also achieved. Flexibility in operation is obtained that permits the separate recording of reactions that tend to overlap. Although the apparatus has been operated principally with a combustible gas indicator serving to meter the evolved product vapors, a number of options are available for the latter function, including flowmeters and various continous gas analyzers. The applicability of the method appears promising.