FILLER REINFORCEMENT OF POLYURETHANE BINDER USING A NEUTRAL POLYMERIC BONDING AGENT

摘要

An effective neutral polymeric bonding agent (NPBA) is disclosed for a polar filler such as crystals of a nitramine (HMX or RDX, for example) dispersed in a polar binder, such as energetic binders containing nitro- and nitrato-plasticizers. The exceptional strength of the propellant composite of this invention is derived from an NPBA tailored to conform to criteria found to take advantage of the surface and adsorption properties of the sytem so as to inculcate such strength. In particular, an interpolymer of acrylonitrile, methylacrylate and hydroxyethylacrylate can be tailored to provide an NPBA for a submix of an OH-terminated prepolymer and polar nitro- or nitrato-plasticizers, such as nitroglycerine, which have solubility parameters in about the same range. Typically the submix includes HMX, RDX, ammonium perchlorate and the like along with fuel particles such as aluminum, boron, and the like.