Synthesis and Characterization of Energetic Thermoplastic Elastomers (ETPEs) Based on 3,3-Bis(Azidomethyl)Oxetane(BAMO)-3-Azidomethyl-3 MethylOxetane (AMMO) Copolymers

摘要

Energetic thermoplastic elastomers (ETPEs) are attractive binder systems for advanced solid rocket propellants.Synthesis of promising ETPEs,viz.Poly[3,3-Bis(Azidomethyl)Oxetane (BAMO)-Co-3-Azidomethyl-3-MethylOxetane(AMMO)] comprising hard crystalline BAMO segment and the soft/amorphous AMMO segment has been reported in the present work.ETPEs of 80:20 BAMO-AMMO and 50 :50 BAMO-AMMO copolymer have been synthesized.The 80 :20 copolymer melts at 51 deg C with T_g of -48 deg C and shows thermal stability upto 249 deg C while the 50 :50 copolymer is a thick viscous polymer with T_g of -50 deg C and shows thermal stability upto 248 deg C.DSC results bring out that poly-AMMO is more stable than poly-BAMO.BAMO-AMMO copoly-mers decomposed with T_(max) close to that of poly-BAMO.TG-FTIR studies establish that the decomposition profiles of poly-AMMO and poly-BAMO are same with the predominance of liberation of HCN in the latter.In case of the copolymers,HCN content increases with the increase in BAMO content.