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Polybutadiene acrylonitrile
Polybutadiene acrylonitrile (PBAN) copolymer, also noted as polybutadiene — acrylic acid — acrylonitrile terpolymer is a copolymer compound used most frequently as a rocket propellant.
This was the binder formulation widely used on the 1960-70's big boosters (e.g., Titan III and Space Shuttle SRBs). It is also sometimes used by amateurs due to simplicity, very low cost, and lower toxicity than the more common hydroxyl-terminated polybutadiene (HTPB). HTPB uses isocyanates for curing, which have a relatively quick curing time; however, they are also generally toxic. PBAN based propellants also have a slightly higher performance than HTPB based propellants.〔http://www.braeunig.us/space/propel.htm〕
PBAN is normally cured with the addition of an epoxy resin, taking several days at elevated temperatures to cure.
==Past Uses==
PBAN was to be used in the Constellation program, later canceled, as this copolymer was to be used in the first stage of the Ares I rocket in five segments. However future versions of Ares I were discussed using liquid fuels as a potential alternative.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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