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 sensitise 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 sensitise are those which fail catastrophically, either by fracture or localised 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 analysing TG and DSC traces which gives all three reaction parameters (E,A,n) characterising an nth order reaction from a single trace. The final areas of research described are concerned with the analysis of (i) isothermal kinetic data and (ii) dynamic kinetic data from solid-state reactions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA103275
Entities
People
- G. M. Swalloe
- John Edwin Field
- M. M. Chaudhri
- T. B. Tang
Organizations
- University of Cambridge