Development of methods for application of polyurethane spray foam insulation systems to liquid hydrogen tanks
Polyurethane spray foam insulation system application methods for liquid hydrogen tanks
Carter, J. M.↗
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A linear compressibility assumption for the multiple integral representation of nonlinear creep of polyurethane
Linear compressibility assumption incorporated into third order multiple integral representation of nonlinear creep of polyurethane, reducing time independent kernel functions
Findley, W. N.↗
Cryogenic properties of a polyurethane adhesive
Polyurethane adhesives differential thermal analysis, rebound resilience and tensile properties at cryogenic temperatures
Robbins, R. F.↗
Cryogenic properties of a polyurethane adhesive
Resilience and tensile properties of polyurethane adhesive at cryogenic temperatures measured by differential thermal analysis
Robbins, R. F.↗
Preparation of highly fluorinated polyurethanes
New polyurethanes, formed from a reaction of a prepolymer diol and a perfluorinated diisocyanate, are nonflammable and possess high corrosion resistance and good low temperature flexibility. Polymer hardness increases rapidly with increasing ratio of diisocaynate to diol, but its glass transition temperature is not adversely affected.
Rochow, S. E.↗
Rigid open-cell polyurethane foam for cryogenic insulation
Lightweight polyurethane foam assembled in panels is effective spacer material for construction of self-evacuating multilayer insulation panels for cryogenic liquid tanks. Spacer material separates radiation shields with barrier that minimizes conductive and convective heat transfer between shields.
Faddoul, J. R.↗
Modified polyurethane foams for fuel-fire Patent
Modification of polyurethanes with alkyl halide resins, inorganic salts, and encapsulated volatile and reactive halogen for fuel fire control
Parker, J. A.↗
The fracture energy and some mechanical properties of a polyurethane elastomer.
The energy required to form a unit of new surface in the fracture of a polyurethane elastomer is determined. The rate sensitivity of the material has been reduced by swelling it in toluene. This paper primarily describes the experimental work of measuring the lower limit of the fracture energy. With this value and the creep compliance as a basis, the rate dependence of fracture energy for the unswollen material has been determined. It is thus shown that the dependence of the fracture energy on the rate of crack propagation can be explained by energy dissipation around the tip of the crack. Good agreement between the theoretically and experimentally determined relationships for the rate-sensitive fracture energy is demonstrated.
Mueller, H. K.↗
Polyurethanes of fluorine containing polycarbonates
The polyurethane polymer prepared by reacting a hydroxy-terminated carbonate with an organic diisocyanate is examined.
Trischler, F. D.↗
Polyurethanes from fluoroalkyl propyleneglycol polyethers
A description is given of highly stable polyurethane polymers prepared by reacting a polyether with a diisocyanate. Compounded stocks of these polymers may be shaped and cured in conventional equipment used in the rubber industry. The solutions are dispersed gels prepared from the polymers and may be used for forming supported or unsupported films for coating fabrics or solid surfaces, and for forming adhesive bonds between a wide variety of plastics, elastomers, fabrics, metals, wood, leather, ceramics and the like.
Trischler, F. D.↗
Fluorine containing polyurethane
A polyurethane polymer prepared by reacting a hydroxy-terminated polyformal with an organic diisocyanate is presented.
Trischler, F. D.↗
Highly fluorinated polyurethanes
The reaction perfluorinated hydroxyl terminated polyether with diisocyanate to form polyurethane is discussed. Data are given on the resin's oxidation stability, chemical resistance, and low temperature flexibility.
Stump, E. C., Jr.↗
Polyurethane retainers for ball bearings
Evaluation of a new ball bearing retainer material is reported. A special composite polyurethane foam ball retainer has been developed that has virtually zero wear, is chemically inert to hydrocarbon lubricants, and stores up to 60 times as much lubricant per unit volume as the most commonly used retainer material, cotton phenolic. This new retainer concept shows promise of years of ball bearing operation without reoiling, based on life testing in high vacuum.
Christy, R. I.↗
Fiber-modified polyurethane foam for ballistic protection
Closed-cell, semirigid, fiber-loaded, self-extinguishing polyurethane foam material fills voids around fuel cells in aircraft. Material prevents leakage of fuel and spreading of fire in case of ballistic incendiary impact. It also protects fuel cell in case of exterior fire.
Fish, R. H.↗
Diamine curing agents for polyurethanes
Three aromatic diamines have properties that make them promising candidates as curing agents for converting isocyanates to polyurethanes with higher adhesive strengths, higher softening temperatures, better toughness, and improved abrasion resistance.
Bell, V. L.↗
Polyurethane adhesive with improved high temperature properties
A polyurethane resin with paste activator, capable of providing useful bond strengths over the temperature range of -184 C to 149 C, is described. The adhesive system has a pot life of over one hour. Tensile shear strength ratings are given for various adhesive formulations.
Stuckey, J. M.↗
Toxicity studies of a polyurethane rigid foam
Relative toxicity tests were performed on a polyurethane foam containing a trimethylopropane-based polyol and an organophosphate flame retardant. The routine screening procedure involved the exposure of four Swiss albino male mice in a 4.2 liter hemispherical chamber to the products generated by pyrolyzing a 1.00 g sample at a heating rate of 40 deg C/min from 200 to 800 C in the absence of air flow. In addition to the routine screening, experiments were performed with a very rapid rise to 800 C, with nominal 16 and 48 ml/sec air flow and with varying sample rates. No unusual toxicity was observed with either gradual or rapid pyrolysis to 800 C. Convulsions and seizures similar to those previously reported were observed when the materials were essentially flash pyrolyzed at 800 C in the presence of air flow, and the toxicity appeared unusual because of low sample weights required to produce death.
Hilado, C. J.↗
Effect of foam age on toxicity of pyrolysis gases from polyurethane flexible foams
The toxicity of the pyrolysis gases from some samples of polyurethane flexible foams appears to have decreased with age, while other samples seem to exhibit no significant change with age in this respect. The changes observed were greater than could be accounted for by variations in the material, or test variations or artifacts.
Hilado, C. J.↗