Abstract: The invention relates to an improved sampling device for selectively collecting gaseous and aerosol pollutants contained in polluted air, said device being of the type comprising a cartridge provided with an inlet, an outlet and filtering means, a vacuum pump and means for connecting said pump to the outlet of the cartridge to cause some pulluted air to be drawn through said filtering means, the improvement wherein said filtering means consists of three successive filters and wherein: the first filter is made with a material of such a porosity that it collects aersol pollutants but is permeable to gas; the second filter is positioned downstream of the first filter and consists of a porous substrate impregnated with an effective amount of a chemical compound that reacts with one or more specific harmful or toxic gaseous pollutants to produce therefrom derivatives, said second filter being of such a porosity as to be permeable to air but not to said derivatives; and the third filter is positioned downstream of

Abstract: A curable binder for use in forming a castable propellant of the hydroxy-terminated polybutadiene type which uses a combination of two bonding agents, an aziridine polyester and an amine polyester. The amount of aziridine polyester is reduced by a factor of 3 to 4 compared to known systems. Improved propellant properties, including elongation at maximum load and at rupture, while maintaining comparable tensile strength and initial moduli, are obtained. A diisocyanate curing agent, an antioxidant such as di-tert-butylhydroquinone or phenyl-beta-naphthyl amine and combinations of antioxidants, and isodecyl pelargonate as a plasticizer, may be included.

Abstract: A curable binder for use in forming a castable propellant of the hydroxy-terminated polybutadiene type which uses a combination of two bonding agents, an aziridine polyester and an amine polyester. The amount of aziridine polyester is reduced by a factor of 3 to 4 compared to known systems. Improved propellant properties, including elongation at maximum load and at rupture, while maintaining comparable tensile strength and initial moduli, are obtained. A diisocyanate curing agent, an antioxidant such as di-tert-butylhydroquinone or phenyl-beta-naphthyl amine and combinations of antioxidants, and isodecyl pelargonate as a plasticizer, may be included.

Abstract: Pour-castable composites are disclosed having mechanical properties such that they are useful either as a high-energy explosives or as propellants. The novel composites include (a) either RDX or HMX as a solid highly-energetic ingredient; (b) a hydroxy-terminated polybutadiene based binder; (c) a diisocyanate curing agent, and (d) a compound of the structural formula ##STR1## wherein R is CH.sub.3, CH.sub.3 (CH.sub.2).sub.x or C.sub.x H.sub.(2x+1), and where x is an integer from 1 to 6, alone or mixed with N,N-di-(2-hydroxyethyl)-4,4-dimethylhydantoin as chemically compatible surfactants.

Abstract: Useful hydroxyl-terminated polyolefin prepolymers, e.g. polybutadiene prepolymers, are provided which may be cross-linked with an epoxide to yield a polyether elastomeric material or with a mixture of an anhydride and an epoxide to form a polyester material. One such prepolymer is a carboxyl-terminated polyolefin, e.g. polybutadiene prepared by reacting a hydroxy-terminated polyolefin, e.g. polybutadiene with solid or liquid anhydrides. Polyether and polyester propellants containing up to about 88% of solid ammonium perchlorate in the powder form and aluminum powder may be prepared from the above two materials (binders). The physical and mechanical properties from these propellants depend on the ratios and on the order of addition of each ingredient, the curing temperature and the presence of surface-active agents. Polyester propellants may be made either by using the hydroxy-terminated polyolefin, e.g. polybutadiene prereacted with anhydrides or by mixing simultaneously all ingredients with the solids.

Abstract: The disclosed invention is a gravity pourable explosive composition comprising a solid explosive ingredient, a polybutadiene based binder cured with a diisocyanate, and an organofunctional silane. The explosive composition according to the invention exhibits improved physical properties e.g. viscosity and gel time, which facilitates product, particularly at low temperatures; and improved mechanical properties eg. elongation and strain.