Determination of Kinetic Parameters for Thermal Decomposition of Phenolic Ablative Materials by Multiple Heating Rate Method
Abstract
The rate of decomposition for two widely used glass- and asbestos- phenolic ablative materials were measured using standard thermogravimetric techniques. Thermograms were obtained at six heating rates ranging from 10 degrees C/min to 160 degrees C/min. From these data, the kinetic parameters were determined by a slightly modified version of Friedman's method. Fractional weight loss calculated using the derived kinetic parameters over the temperature range of decomposition agreed with measured values with a mean error of 0.33 and 0.28 percent, with a standard deviation of errors 0.58 and 0.84 percent for glass- and asbestos-phenolic, respectively. The 95-percent confidence for the mean error was 0.22 and 0.44 percent for the glass-phenolic and 0.14 and 0.42 percent for the asbestos-phenolic. Also, the activation energy was calculated by the Flynn and Wall method. The average activation energy values determined by the two methods agreed within 4.6 percent for both materials.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1980
- Accession Number
- ADA087929
Entities
People
- G. R. Moore
- J. A. Wiebelt
- J. B. Henderson
- M. R. Tant
Organizations
- Naval Surface Warfare Center Dahlgren Division