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  • 1
    Electronic Resource
    Electronic Resource
    1,2-Dinitrile polymers. I. Hompolymers and copolymers of fumaronitrile, maleonitrile, and succinonitrile (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 3059-3073 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Homopolymers and copolymers of fumaronitrile, maleonitrile, and succinonitrile have been prepared by using medium high temperature free-radical initiators. Black, nonfusible but soluble polymers were obtained. The spectroscopic and chemical evidence indicated a structure containing α-pyrrolenine rings and no free nitrile groups in the fumaronitrile and maleonitrile polymers and 1-pyrroline rings and free nitrile groups in the succinonitrile polymers. The polymers possessed good thermal stability, free spin concentration of 1017-1018 spins/g, and an ac conductivity at room temperature in nitrogen of 10-6 to 10-8 ohm-1 cm-1.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150061110
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Direct rotating-sector studies of the systems: Styrene-methyl methacrylate and styrene-methyl acrylate (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 8 (1970), S. 3461-3481 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rotating-sector technique was applied directly in a study of two copolymerization systems: styrene-methyl methacrylate and styrene-methyl acrylate. The two coupled rate expressions which describe the change in radical concentrations for two-component polymerizations degenerate into a single expression identical in form to the radical expression for a homopolymerization when the ratio of the radical concentrations under intermittent illumination is assumed constant and equal to the ratio under steady illumination. Numerical solutions of the complete rate expression by use of constants from the literature confirm that this assumption is valid for a rotating-sector experiment. The overall lifetimes of these two-component systems were defined and measured experimentally as a function of monomer composition and then compared with lifetimes calculated by using literature rate constants. The agreement was satisfactory. The direct application of the technique to the two-component system provides an independent experiment which for some systems seems to be more sensitive to the value of the cross-termination constant than the usual steady-state method.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.150081209
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  • 3
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    Investigation of the free flow electrophoretic process (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of gravity on the free flow electrophoretic process was demonstrated. The free flow electrophoresis chamber used to demonstrate the effects of gravity on the process was of a proprietary design. This chamber was 120 cm long, 16 cm wide, and 0.15 cm thick. Flow in this chamber was in the upward direction and exited through 197 outlets at the top of the chamber. During electrophoresis a stream of sample was injected into the flow near the bottom of the chamber and an electrical field was applied across the width of the chamber. The field caused a lateral force on particles in the sample proportional to the inherent change of the particle and the electric field strength. Particle lateral velocity was then dependent on the force due to viscous drag which was proportional to particle size and particle shape dependent.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-161523 , MDC-E2275
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Investigation of the free flow electrophoretic process. Volume 1: Executive summary (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of gravity on the free flow electrophoretic process was investigated. The demonstrated effects were then compared with predictions made by mathematical models. Results show that the carrier buffer flow was affected by gravity induced thermal convection and that the movement of the separating particle streams was affected by gravity induced buoyant forces. It was determined that if gravity induced buoyant forces were included in the mathematical models, then effective predictions of electrophoresis chamber separation performance were possible.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-161241 , MDC-E2000-VOL-1
    Format: application/pdf
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  • 5
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    Investigation of the free flow electrophoretic process. Volume 2: Technical analysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of gravity on the free flow electrophoretic process was investigated. The demonstrated effects were then compared with predictions made by mathematical models. Results show that the carrier buffer flow was affected by gravity induced thermal convection and that the movement of the separating particle streams was affected by gravity induced buoyant forces. It was determined that if gravity induced buoyant forces were included in the mathematical models, then effective predictions of electrophoresis chamber separation performance were possible. The results of tests performed using various methods of electrophoresis using supportive media show that the mobility and the ability to separate were essentially independent of concentration, providing promise of being able to perform electrophoresis with higher inlet concentrations in space.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-161240 , MDC-E2000-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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