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  • 2005-2009
  • 1960-1964  (6)
  • Chemistry  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Mass transfer in liquid-lithium systems (1960)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 6 (1960), S. 139-144 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The behavior of type-304 stainless steel in a forced-convection closed-loop lithium system was investigated over a wide range of temperatures and velocities. Fundamental information concerning the mechanism for mass transport has been obtained by examining solution and deposition effects along flat plates. The rate-determining process for solution is transport from the solid to the interface, whereas deposition rates are liquid-phase controlled.Liquid-phase mass transfer coefficients were correlated with a maximum deviation of approximately 15% by the use of von Kàrmàn's analysis of the turbulent boundary layer along a flat plate, combined with the Chilton-Colburn empirical modification of the Schmidt group. In contrast no adequate model is available for the prediction of solution rate constants which must be determined experimentally. Mean values of the solution rate constants ranged from 0.154 to 0.750 × 10-5 cm./sec. at temperatures from 510° to 612°C. These values are on the order of 103 smaller than corresponding liquid-phase mass transfer coefficients.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690060127
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mass transfer with liquid lithium in circular conduits (1961)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 7 (1961), S. 216-220 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Forced convection mass transfer between circular tubes and liquid lithium was experimentally investigated over a range of Schmidt numbers from 40 to 57 and Reynolds numbers from 5,550 to 22,500. Information concerning the mechanism for mass transfer was obtained by measuring local solution and deposition rates as a function of distance along the tubes. Observed entrance effects for the solution process suggest that it involves the parallel mechanisms of diffusion through a solid film and through occluded liquid in grain boundaries. It is indicated that the relative contributions of these processes changes with increasing temperature.A j-factor correlation of existing liquid metal mass transfer data for fully developed conditions in circular conduits is presented and indicates that an exponent of 0.112 for NRe best represents the data. This result agrees well with other studies (9).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690070210
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The rate of glycerol absorption by ion exchange resins (1963)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 9 (1963), S. 283-287 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690090229
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transport of liquids in structurally modified polyethylene (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 897-933 
    Details
    ISSN: 0021-8995
    Keywords: 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 , Physics
    Notes: Cast linear polyethylene films subjected to dry and solvent annealing display markedly different sorption and difusion barrier properties than do untreated films. The subsequent sorption of liquid o- and p-xylene and cis- and trans-acetylene dichloride per unit volume of amorphous polymer increases as the annealing temperature and/or treating solvent concentration increases. Integral diffusivities calculated from sorption and steady-state permeation rates show a monotonic increase with sorption per unit volume of amorphous polymer. The concentration dependence, however, is less marked than observed in similar systems at low permeant activity. Apparently the above treatment reduces the effective crosslinking imposed by the crystallites on the amorphous polymer chains through disentangling and incorporating some of these chains into crystallites. Thus the polymer is capable of a greater degree of swelling when brought into contact with a compatible liquid in a spite of a higher degree of crystallinity. The low concentration dependence of the diffusivities is probably due to heterogeneous distribution of excess permeant in a treated film. If the excess permeant were preferentially sorbed in regions of low polymer concentration then the above observations could be explained. Long-duration, osmotic stress-induced swelling and recrystallization have been cited to account for time-dependent permeation rates in treated and untreated films.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080229
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Some effects of cocatalyst structure on the anionic polymerization of ε-caprolactam (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 1363-1369 
    Details
    ISSN: 0021-8995
    Keywords: 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 , Physics
    Notes: N-Acetyl, N-butyryl, N-stearyl, N-benzoyl, N-4-methoxybenzoyl, and N-4-nitrobenzoyl caprolactams were prepared and used as cocatalysts for the anionic polymerization of caprolactam. The results of these studies indicate that all of the cocatalysts used, except N-acetylcaprolactam, exert a steric effect which lowers both the rate and degree of polymerization. The N-benzoyl derivative appeared to be a slightly better cocatalyst than the N-4-methoxybenzoyl derivative. This may be due to the fact that the N-benzoyl group is the more electron-attracting group. N-4-Nitrobenzoylcaprolactam was unstable under the reaction conditions employed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080326
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Carriers and unpaired spins in some organic semiconductors (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 2787-2806 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Semiconduction and electron spin resonance studies on a number of conjugated polymers representative of the polyacetylenes, the polybenzimidazoles, and the polyacene quinone radical polymers were made. Observed resistivities ranged from 270 to 1016 ohm-cm. at room temperature. These and the spin concentrations, the relaxation times, and the energies of activation of conductance and spin concentration were found to be functions of the molecular structure. It was considered impressive evidence that impurity effects on the electronic properties of molecular solids are far less than those commonly observed with the covalently bonded semiconductors such as Ge and Si, for example. A detailed analysis was made of the carrier and free radical formation and life-times in these ekaconjugated molecular solids using a simple model.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100020629
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    Paper (German National Licenses)
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