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2014
Conference Paper
Titel
New energetic thermoplastic elastomers for pressed explosive charges
Abstract
Four different energetic thermoplastic elastomers (ETPEs) from glycidyl azide polymer (GAP) and isocyanates with 2,2-bis(bromomethyl)propane-1,3-diol (DAP) as chain extender were synthesized. It was proven that DAP is a promising monomer in ETPE synthesis, offering the opportunity to get elastomers with tailored hard-block segments and thus specific mechanical properties. Two aromatic diisocyanates for polyaddition were explored and the properties of the different ETPEs compared. A broad variety of consistency, from sticky paste to rubbery flakes could be obtained. One specific ETPE was chosen and characterized by means of temperature-dependant viscosity. A PBX formulation based on HMX and TEX was developed, and two formulations, one with ETPE as energetic binder and another one with paraffin wax as inert binder were manufactured. Pressing of cylindrical compacts yielded explosive charges with > 97 % TMD. Characterization of explosive properties shows that PBX with ETPE binder has comparable detonation velocity but significantly increased detonation pressure compared to PBX with inert binder. Gap-test determined equal shock wave sensitivity of both PBX at 20.4 kbar GO / 17.2 kbar No-GO.
Author(s)