Adiabatische Selbstaufheizung von Festtreibstoffen auf Basis Epsilon-CL20 (HNIW), Ammoniumperchlorat, GAP-Binder und energetischer Weichmacher

Seven formulations based on epsilon-CL20 (epsilon-HNIW, hexanitrohexazaisowurtzitane), ammonium perchlorate, GAP binder and the energetic plasticizers TMETN, BTTN and GAP-A have been investigated by adiabatic self heating measured by an ARCTM (Accelerating Rate Calorimeter) in the temperature range 120°C to 190°C. The formulations have been designed to get high burning rates for the application in high velocity tactical missiles. According to the behaviour of the adiabatic self heating the formulations split into two groups. The significant difference in composition is that the first group contains no GAP-A, only TMETN as energetic plasticizer and the second group with five formulations contains GAP-A between 9 and 14 mass-%. The first group reaches deflagration during self heating in shorter times and at lower temperatures between 155 and 160°C. The second group shows deflagration above 183°C. These formulations evolved heats of decomposition of about 240 J/g which is twice as high as the ones from the first group. The group containing GAP-A shows retardation of the adiabatic self heat rate between 160°C and 175°C. This effect is assigned to the phase transition of å-CL20 to ã-CL20. In all formulations the same lot of å-CL20 was used. Nevertheless the minima of the retarded self heat rate occur at different temperatures, which correlate with the contents of GAP-A or TMETN.