Studies on properties of ETPUEs containing PET and GAP as soft-segment

A series of energetic thermoplastic polyurethane elastomer(ETPUE), which contain glycidyl azide polymer(GAP) and ethylene oxide/tetrahydrofuran copolyether(PET) as the soft segment, and 2, 2-bis(azidomethyl) propane-1, 3-diol and 4, 4'-dicyclohexyl-methane diisocyanate(HMDI) as the hard segment, were synthesized through bulk polymerization, with the hard segment content fixed at 55%.The experimental techniques utilized were FTIR, DSC, DMA, and tensile testing. The results show that the ETPUE has the character of the GAP-based energetic elastomer. It is also observed that all ETPUE has obvious two phase separation characteristics, T_g of GAP in the ETPUE became lower after the introduction of PET, and all ETPUE studied at all-levels of PET content are amorphous. The glass transition of PET could be observed when the PET reaches 30% of the soft-segment. Tensile strength of the ETPUE decreases with the PET content increasing, while the elongation-to break increases.It has a favorable property with PET content in the soft-segment controlled at 30%~40%.