Polyglycidyl nitrate (PGN)-based energetic thermoplastic polyurethane elastomers with bonding functions

PGN-based ETPUEs were synthesized using mixture of chain extenders including 1, 4-butanediol and Diethyl Bis(hydroxymethyl)malonate (DBM). Through the special chain extenders DBM, the -COOR was introduced into the energetic thermoplastic polyurethane elastomers (ETPUEs) and further enhances the adhesion between ETPUE and nitramine solid ingredients in propellants. From the analysis, with the percentage of DBM increasing, the work of adhesion (W_a) between nitramine solid ingredients and ETPUEs increased and the maximum stress (σ_m) of ETPUEs decreased on the other hand. In order to test the bonding functions of different ETPUEs, the RDX/ETPUE propellants were prepared and the stress-strain curves of all propellants were tested. The results showed that the ETPUE-75 with 75% DBM can prevent the dewetting and improve the mechanical properties of propellants. The ETPUE prepared with chain extender including 1, 4-butanediol and DBM were valuable for application in propellants.