Thermal analysis kinetics-problems, pitfalls and how to deal with them

Journal of Thermal Analysis - Tập 34 - Trang 367-381 - 1988
J. H. Flynn1
1Scientific Thermal Research & Data Analysis (STRDA), Bethesda, USA

Tóm tắt

The kinetics of the heterogeneous, condensed-phase systems studied in thermal analytical techniques are often complex and usually affected by many experimental factors such as specimen geometry, thermal history, gaseous environment, etc. These complications impose many problems in experimental design, data analysis, and especially in interpretation of results. This paper concerns itself with practical applications of thermal analysis kinetics. Ways of overcoming, or at least ameliorating, some of the above problems are suggested, and caveats concerning overly simple and “canned” techniques of analysis of kinetics data are given. The limitations of one's reasonable expectations for the theoretical significance and empirical application of derived kinetics parameters are discussed.

Tài liệu tham khảo

J. H. Flynn and L. A. Dunlap, Thermochim. Acta, 105 (1986) 215–218. A. R: McGhie, Anal. Chem., 55 (1983) 987. J. H. Flynn, “Thermogravimetric Analysis and Differential Thermal Analysis,” Chapt. 12, pp. 573–615 in “ Aspects of Degradation and Stabilization of Polymers,” Ed. H. H. G. Jellinek, Elsevier, New York, 1978. A. Gray, in “Analytical Calorimetry,” Vol. 1, R. S. Porter and J. F. Johnson, eds, Plenum, New York, 1968, p. 209. J. H. Flynn and B. Dickens, “Applications of New Kinetic Techniques to the Lifetime Prediction of Polymers from Weight-Loss Data,” pp. 163–186 in “Durability of Macromolecular Materials,” R. K. Eby, Ed., ACS Symposium Series No. 96, American Chemical Society, Washington, 1979. J. H. Flynn, in R. F. Schwenker, Jr. and P. D. Garn (eds), Thermal Analysis (ICTA-2), Vol. 2, Academic Press, New York, 1969, p. 1111. H. L. Friedman, J. Polym. Sci., 50 (1965) 183. (See also T. Ozawa, J. Thermal Anal., 31 (1986) 547, Thermochim. Acta, 100 (1986) 109.) T. Ozawa, Bull. Chem. Soc. Japan, (1965) 1881. J. H. Flynn and L. A. Wall, Polym. Lett., 4 (1966) 191. J. H. Flynn and L. A. Wall, J. Res. Nat. Bur. Standards A. Phys. Chem., 70A (1966) 487. J. H. Flynn, “Analysis of Thermogravimetric Kinetics—Overcoming Complications of Thermal History,” Chapter 3. in “Thermal Analysis in Polymer Characterization”, ed., E. Turi, Hayden, London, 1981, pp. 43–58. J. H. van't Hoff, in “Studies in Chemical Dynamics” (revised by Cohen, E.: translated by Ewan, T.) Chem. Pub. Co., Easton, PA 1896. M. Letort, J. Chim. Phys., 34 (1937) 206.