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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Effects of composition and irradiation on glass transition temperature of methyl methacrylate- styrene copolymers
Radiolytic stress relaxation of ethylene-propylene copolymer network to study gamma ray-induced chain scission, cross linking and gel dose
Melting point, melting range, and crystallinity of extended-chain copolymer crystals
Superheating crystallization of ethylene- propylene and ethylene-butene-1 copolymers and extended chain morphology
Graft copolymers and polyblends of beta- vinylnaphthalene and ethylene oxide exhibiting modulus vs temperature minimum and rubbery properties at room temperature
Polymer chemistry and thermal stability of benzimidazole aromatic imide copolymers
Low temperature measurements of length- temperature curves of polyethylene, polypropylene, mixtures of polyethylene and polypropylene, and copolymers
Synthesis of carboxyl terminated butadiene/ isoprene copolymer polymerized by anionic techniques and hydrogenated to minimum residual unsaturization for use as propellant binder
Influence of plasticizer added to pure cold setting epoxy polymer studied by testing copolymers in creep and relaxation at various temperatures
Synthesis and analysis of ethylene-neohexene copolymers with other non ketene-imine group free radicals for solid and hybrid grain propellant saturated hydrocarbon binder program
Ethylene/methyl acrylate copolymer synthesis for silver-zinc battery separators
Managing trash accumulation is a critical challenge in human space explorations since the trash volume and mass can significantly influence launch cost and operational efficiency. This study aids the development of a Mechanical Trash Compactor (Mpactor) by testing the removal force required to remove a “trash bag” from the Mpactor. To do this, a Pneumatic Pressure Mandrel System was designed to simulate the normal force trash would exerts on the trash bag and subsequently the sidewalls of the Mpactor. For various levels of sidewall normal force, the removal force required to remove the simulated trash bag from the Mpactor compaction chamber was measured. This testing is used to identify optimal bag materials. Additionally, testing was done on both the native stainless steel walls of the compaction chamber as well as the walls after being Teflon lined. Split-plot ANOVA, simple main effects analysis, Holm’s post hoc comparisons for interaction, and sensitivity analyses were conducted to assess the influence of trash bag and sidewall materials on the required removal force. It was found that Teflon reduced the force required to remove the trash bag as well as reduced material-dependent variation in removal force. Testing showed that Teflon reduced the required removal force with a Polyvinylidene Fluoride , an unidentified Ethylene acrylate - Low Density Polyethylene copolymer, and a Polyvinyl Chloride all requiring significantly less removal force than the other materials tested.
Thermal polymer characteristics of neutral alpha- amino acids with dicarboxylic amino acids or lysine
Copolymerization of Leuchs anhydrides of eighteen amino acids common to protein
Saturated hydrocarbon polymeric binder for advanced solid propellant and hybrid solid grains