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  • 1
    Electronic Resource
    Electronic Resource
    The thermal conductivity of R22, R142b, R152a, and their mixtures in the liquid state (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 937-950 
    Details
    ISSN: 1572-9567
    Keywords: mixtures ; R142b ; R152a ; refrigerants ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental apparatus for measuring the thermal conductivity of liquids by the transient hot-wire method was constructed and tested with toluene as a standard liquid. Measurements were performed on R22, R142b, and R152a. The thermal conductivities of mixtures of R142b and R152a with R22 were also measured by varying the weight fraction of R22. Experiments were performed in the range from −50 to 50°C and from 2 to 20 MPa and the measured data are analyzed to obtain a correlation in terms of temperature, pressure, and composition of the mixture. While the thermal conductivity of R22 + R152a mixtures varies monotonously with composition, that of R22 + R142b mixtures turned out to go through an extremum value. The accuracy of our measurements is estimated to be within 2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502116
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal conductivity of R32 and its mixture with R134a (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 1193-1201 
    Details
    ISSN: 1572-9567
    Keywords: R134a, R32 ; R32+R134a mixture ; thermal conductivity ; transient hot-wire method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The liquid thermal conductivity of R32 (CH2F2) and R134a (CF3CH2F) was measured in the range from 223 to 323 K and from 2 to 20 MPa by the transient hot-wire method. The thermal conductivity of the R32+R134a mixture was also measured in the same range by varying the mass fraction of R32. The measured data are analyzed to obtain a correlation in terms of temperature, pressure and composition of the mixture. The uncertainty of our measurements is estimated to be within ±2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02081287
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Curing and phase separation behavior of amine terminated butadiene acrylonitrile copolymer (ATBN) modified epoxy (1990)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 211-217 
    Details
    ISSN: 1042-7147
    Keywords: Phase separation ; Curing ; Vitrification ; Light scattering ; ATBN ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The vitrification effect during the curing reaction of amine terminated butadiene acrylonitrile copolymer-(ATBN)-modified epoxy resin is studied by the differential scanning calorimetry. A new reaction kinetic equation is derived to describe the effect of vitrification on the reaction rate at both glassy and rubbery state of reactants. ATBN is added to improve the impact properties of the cured epoxy resin. The phase separation behavior during the curing reaction is analyzed by the light scattering and turbidity experiments. From the results of the cloud point measurements, it is observed that the ATBN-epoxy system showed upper critical solution temperature (UCST) behavior. From the results of the light scattering experiments, the domain correlation length increases as the content of ATBN increases.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1990.220010304
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    Paper (German National Licenses)
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