关键词: 热塑性;弹性体;聚氨酯推进剂;推进剂粘合剂;推进剂增塑剂;推进剂性能

Abstract: A novel thermoplastic polyurethane elastomer based on co polyether (ethyleneoxide tetrahydrofunan) as soft segments,isophorone diisocyanate and 1,4 butanediol as hard segments was synthesized It was used as propellant binder In order to increase the miscibilities of thermoplastic polyurethane elastomers with nitrate ester, polyethyleneglycol was incorporated with co polyether (ethyleneoxide tetrahydrofunan) as soft segments When the molecular weights and contents of polyethyleneglycol were controlled to 4000 and 6% of soft segments respectively, the properties of thermoplastic polyurethane elastomers were perfect The plasticizing ratio that nitrate ester to thermoplastic polyurethane elastomers exceeded 4 and no crystallinities were determined under room temperature The propellant sample was prepared by conventional absorption rolling extrusion process and the mechanical and combustion properties were evaluated The maximum impulse reached up to 2 598 N·s/kg~2 648 N·s/kg and was a little higher than HTPB propellant Measured results revealed that a promising TPE propellant candidates showed good processing temperature (<393 K) and excellent mechanical properties The burning rate pressure exponent reached as low as 0 36, which lends to a easy control in propellant combustion without the addition of burn rate catalysts

Key words: Thermoplasticity;Elastomer;Polyurethane propellant;Propellant binder;Propellant plasticizer;Propellant property