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Polybutadiene acrylonitrile
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<p>Polybutadiene acrylonitrile (PBAN) <a href="/facts/Copolymer/35D97DuV">copolymer</a>, also noted as <a href="/facts/Polybutadiene/RxVmrf4B">polybutadiene</a>—<a href="/facts/Acrylic_acid/x2l3lrI2">acrylic acid</a>—<a href="/facts/Acrylonitrile/zvhfg050">acrylonitrile</a> <a href="/facts/Terpolymer/35D97DuV">terpolymer</a> is a copolymer compound used most frequently as a rocket propellant fuel mixed with <a href="/facts/Ammonium_perchlorate/BDMsvjxu">ammonium perchlorate</a> oxidizer. It was the binder formulation widely used on the 1960s–1970s big <a href="/facts/Booster_rocket/cUjIgX4R">boosters</a> (e.g., <a href="/facts/Titan_III/sTTkEDps">Titan III</a> and <a href="/facts/Space_Shuttle_Solid_Rocket_Booster/ETayF0Xh">Space Shuttle SRBs</a>). It is also notably used in NASA's <a href="/facts/Space_Launch_System/DbGCgH1W">Space Launch System</a>, likely reusing the design from its Space Shuttle counterpart. </p><p>Polybutadiene acrylonitrile is also sometimes used by amateurs due to simplicity, very low cost, and lower toxicity than the more common <a href="/facts/Hydroxyl-terminated_polybutadiene/vY8fBq7C">hydroxyl-terminated polybutadiene</a> (HTPB). HTPB uses <a href="/facts/Isocyanate/YYDoDBgp">isocyanates</a> for curing, which have a relatively quick curing time; however, they are also generally toxic. PBAN based <a href="/facts/Composite_propellant/LpEa20Tw">composite propellants</a> also have a slightly higher performance than HTPB based propellants. PBAN is normally cured with the addition of an <a href="/facts/Epoxy/PvlLBgdQ">epoxy</a> resin, taking several days at elevated temperatures to cure. </p>