Synthesis and characterization of 3,3'-bisazidomethyl oxetane-3- azidomethyl-3'-methyl oxetane alternative block energetic thermoplastic elastomer

3,3'-Bisazidomethyl oxetane-3-azidomethyl-3'-methyl oxetane (BAMO-AMMO) tri-block copolymer was successfully synthesized by azidation of a polymeric substrate containing bromo leaving groups, and an alternative block energetic thermoplastic elastomer (ETPE) was prepared by chain extension reaction. The tri-block copolymer was characterized by Fourier transform infrared (FTIR), ¹H NMR, and ¹³C NMR spectroscopy, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). It was found that the composition of the copolymer is nearly 1 : 1; crystallinity of the copolymer (71.81 %) is less than that of PBAMO (78.30 %). This is due to a partly mixture between soft and hard segments. Kinetic result shows that a crosslinking network is formed after the decomposition of azide group. Tensile strength of alternative block ETPE is 150 % of traditionally synthesized BAMO-AMMO ETPE.