Characterization of P(BAMO/AMMO) ETPE Prepared Using Different Diisocyanates

Poly(3,3-bisazidomethyl oxetane/3-azidomethyl-3-methyl oxetane) energetic thermoplastic elastomers (P(BAMO/AMMO) ETPEs) is one of the most valuable ETPEs in the field of energetic binders. P(BAMO/AMMO) ETPEs were prepared using different diisocyanates (TDI, HMDI, IPDI, and HDI) to investigate the influence of the diisocyanate on the performance of P(BAMO/AMMO) ETPEs. Mechanical properties and heats of formation were investigated. FT-IR spectroscopy results showed that TDI-based ETPE has the highest degree of hydrogen bonding with a value of 69.00 %. Mechanical test results showed that the TDI-based ETPE has better mechanical property with maximum stress at 5.24 MPa and breaking elongation at 390 %. The order for degree of hydrogen bonding and mechanical property of different diisocyanate-based ETPEs was TDI>HMDI>IPDI>HDI. The heats of formation were calculated by the group additivity method and by the heat of combustion method. The values of heats of formation for TDI-based ETPE were 3.44 kJ g⁻¹ and 3.75 kJ g⁻¹ according to the two methods. Additionally, TDI-based ETPE has a lager heat of formation than the other ETPEs.