Deformation and Thermal Properties of Energetic Materials
Abstract
The report covers four areas of work. In the first it is shown that some polymers can sensitize explosives in impact situations. The effect is primarily a mechanical one with the production of free radicals by the polymer only of secondary importance. Chemical effects were assessed using TG. High speed photography, with the sample between transparent anvils, was used to photography impacts on polymers, explosives and layers of explosive with polymers added. Polymers which sensitize are those which fail catastrophically, either by fracture or localized adiabatic shear, and which have a low specific heat, latent heat and thermal conductivity. Hot spots in these polymers during rapid deformation can greatly exceed the polymers softening point. This was confirmed by separate experiments with a friction apparatus with hot spot temperatures recorded using I.R. techniques. The second study describes a graphical computer method for analyzing TG and DSC traces which gives all three reaction parameters (E,A,n) characterizing an nth order reaction from a single trace. The final areas of research described are concerned with the analysis of (1) isothermal kinetic data and (2) dynamic kinetic data from solid-state reactions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA096771
Entities
People
- G. M. Swallowe
- John Edwin Field
- M. M. Chaudhri
- Tong B. Tang
Organizations
- University of Cambridge