Accession Number : ADP004455

Title :   Stability and Compatibility Testing Using a Microcalorimetric Method,

Corporate Author : AMERICAN DEFENSE PREPAREDNESS ASSOCIATION ARLINGTON VA

Personal Author(s) : Elmqvist,C. J. ; Lagerkvist,P. E. ; Svensson,L. G.

Report Date : 02 JUN 1982

Pagination or Media Count : 10

Abstract : A microcalorimetric method is used for compatibility and stability studies. The high sensitivity of the instrument permits measurement at 60 C or even lower, i.e. under more realistic conditions than offered by conventional techniques like DTA and vacuum stability tests. The instrument consists of four independent calorimeters with a short thermal relaxation time, high sensitivity and excellent baseline stability. The calorimeters are placed in a common, precisely thermostated water bath. In compatibility studies, heat flow curves are recorded for the pure components and a mixture of these. A theoretical curve is constructed, which simulates a non interacting system. The difference between the theoretical and the experimental curve for the mixture reflects the degree of interaction between the materials. A number of compatibility problems are discussed, including interactions in mixtures of TNT with amine/amide type polymers, polycarbonate - double base propellant interactions under various conditions and the influence of an anaerobic sealant on a high explosive and a propellant. Some results from stability measurements on an igniting compound are also presented.

Descriptors :   *EXPLOSIVES, *PROPELLANTS, *MICROCALORIMETRY, STABILITY, COMPATIBILITY, SENSITIVITY, CALORIMETERS, HEAT TRANSFER, CURVES(GEOMETRY), MIXTURES, INTERACTIONS, TNT, PLASTICS, POLYCARBONATES, DOUBLE BASE PROPELLANTS, SYMPOSIA

Distribution Statement : APPROVED FOR PUBLIC RELEASE