Accession Number : ADA302346

Title :   Thermal and Mechanical Properties of Polyurethane Foams and a Survey of Insulating Concretes at Cryogenic Temperatures.

Descriptive Note : Final rept. Jan 79-Feb 84,

Corporate Author : NATIONAL BUREAU OF STANDARDS BOULDER CO CHEMCIAL ENGINEERING SCIENCE DIV

Personal Author(s) : Sparks, L. L. ; Arvidson, J. M.

PDF Url : ADA302346

Report Date : APR 1984

Pagination or Media Count : 157

Abstract : Thermal and mechanical properties of expanded plastics, foams, are reported. The system studied was rigid, closed cell, CCl3 blown, polyether based polyurethane. The primary temperature range study was 100 to 300K; however, several properties were determined to 4 K. the nominal densities of the foams tested were 32, 64, and 96 Kg/m3. Properties reported are thermal conductivity, thermal expansion, strength and moduli in tension and in compression, proportional limit, yield strength, ultimate strength, and shear strength. Physical properties were determined both parallel and perpendicular to the orthogonal axes of the bulk supplies. The gas content of the specimens was determined using a gas chromatograph mass spectrometer and with gas displacement pychomer. Empirical procedures for estimating the temperature dependent thermophysical properties were developed. These procedures are based on the experimental data and utilize the characterization parameters for molar gas concentration, gas pressure, and cell morphology. Regulations affecting vapor dispersion in the aera around liquefied natural gas facilities make it attractive to construct dikes and impounding areas out of materials having low thermal conductivities. several insulating concretes have the general properties required for such applications. Screening tests were done to determine the thermal con- ductivity, modulus of rupture, and the compressive strength of several polyesterbased materials with glass bead or perlite aggregate and of portland cement based materials with vermiculite or polystyrene aggregate. Abibliography resulting from an extensive literature survey of lightweigth concretes is presented

Descriptors :   *CONCRETE, *POLYURETHANE RESINS, *FOAM, *EXPANDED PLASTICS, THERMAL PROPERTIES, LOW TEMPERATURE, MECHANICAL PROPERTIES, POLYMERS, POLYSTYRENE, MODULUS OF ELASTICITY, GASES, CEMENTS, AGGREGATES(MATERIALS), THERMAL EXPANSION, THERMAL CONDUCTIVITY, MASS SPECTROMETERS, YIELD STRENGTH, COMPRESSIVE STRENGTH, CRYOGENICS, ELONGATION, GAS CHROMATOGRAPHY, POLYESTER PLASTICS, POLYETHERS, SHEAR STRENGTH, PORTLAND CEMENT.

Subject Categories : Ceramics, Refractories and Glass
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE