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  • INORGANIC AND PHYSICAL CHEMISTRY  (5)
  • crosslinked domains  (1)
  • emulsion copolymerization, divinylbenzene  (1)
  • 1
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    Column electrophoresis on the Apollo-Soyuz test project. Experiment MA-011 (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The experimental procedures of the electrophoresis of erythrocytes, lymphocytes and kidney cells on the Apollo Soyuz Test Project are given.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Apollo-Soyuz Test Project; 68 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Process for preparation of large-particle-size monodisperse latexes (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Monodisperse latexes having a particle size in the range of 2 to 40 microns are prepared by seeded emulsion polymerization in microgravity. A reaction mixture containing smaller monodisperse latex seed particles, predetermined amounts of monomer, emulsifier, initiator, inhibitor and water is placed in a microgravity environment, and polymerization is initiated by heating. The reaction is allowed to continue until the seed particles grow to a predetermined size, and the resulting enlarged particles are then recovered. A plurality of particle-growing steps can be used to reach larger sizes within the stated range, with enlarge particles from the previous steps being used as seed particles for the succeeding steps. Microgravity enables preparation of particles in the stated size range by avoiding gravity related problems of creaming and settling, and flocculation induced by mechanical shear that have precluded their preparation in a normal gravity environment.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of results of ASTP experiment in electrophoresis (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Apollo-Soyuz Test Project (ASTP) included an electrophoretic separation experiment of biological cells. The nature separation results of aldehyde-fixed rabbit, human and horse red blood cells, which were taken in the form of photographs taken at three-minute intervals, are the subject of this report. The electrophoretic separation was successful in that fractionation according to mobility did occur and was found in the sliced samples. Photographic evidence indicates that the low electroosmotic methylcellulose coating was successful in reducing the electroosmosis to a near zero value. Also, the flight film shows that the bands migrated down the column as theory would predict, producing two bands of high cell concentration separated and surrounded by regions of lower cell concentration. However, most likely some clumping of cells occurred to cause the trailing band to be larger than expected from theory. Overall, the experiment was a success in demonstrating a static electrophoresis separation under microgravity conditions with a resolution not possible on earth.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-150469
    Format: application/pdf
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  • 4
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    Heterogeneous chemical reactions: Preparation of monodisperse latexes (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: It is demonstrated that a photoinitiated emulsion polymerization can be carried out to a significant conversion in a SPAR rocket prototype polymerization vessel within the six minutes allowed for the experiment. The percentage of conversion was determined by both dilatometry and gravimetric methods with good agreement. The experimental results lead to the following conclusions: (1) emulsion polymerizations can be carried out to conversions as high as 75%, using a stable micellized styrene-SLS system plus photoinitiator; (2) dilatometry can be used to accurately determine both the rate and conversion of polymerization; (3) thermal expansion due to the light source and heat of reaction is small and can be corrected for if necessary; (4) although seeded emulsion polymerizations are unfavorable in photoinitiation, as opposed to chemical initiation, polymerizations can be carried out to at least 15% conversion using 7940A seed particles, with 0.05% solids; and (5) photoinitiation should be used to initiate polymerization in the SPAR rocket experiments because of the mechanical simplicity of the experiment.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-150333
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  • 5
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    Development of stable low-electroosmotic mobility coatings (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Long-time rinsings of the Z6040-methlycellulose coating used successfully on the ASTP MA=011 experiment indicate the permanency of this coating is inadequate for continuous flowing systems. Two approaches are described for developing coatings which are stable under continuous fluid movement and which exhibit finite and predictable electroosmotic mobility values while being effective on different types of surfaces, such as glass, plastics, and ceramic alumina, such as is currently used as the electrophoresis channel in the GE-SPAR-CPE apparatus. The surface charge modification of polystyrene latex, especially by protein absorption, to be used as model materials for ground-based electrophoresis experiments, and the preliminary work directed towards the seeded polymerization of large-particle-size monodisperse latexes in a microgravity environment are discussed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-161244
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of monodisperse porous polymer particles (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 235-244 
    Details
    ISSN: 0887-624X
    Keywords: monodisperse particles ; emulsion copolymerization, divinylbenzene ; porous particles ; macroporous structure ; linear polymer, diluent ; crosslinked domains ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Monodisperse porous polymer particles in the size range of 10 μm in diameter were prepared via seeded emulsion polymerization. Linear polymer (polystyrene seed) or a mixture of linear polymer and solvent or nonsolvent were used as inert diluents. The pore diameters of these porous polymer particles were on the order of 1000 Å with pore volumes up to 0.9 mL/g and specific surface areas up to 200 m2/g. The physical features of the porous polymer particles depended on the diluent type and the crosslinker content, as well as the molecular weight of polymer seed particles. By varying the molecular weight of the linear polymer, monodisperse porous polymer particles with different pore size distribution could be synthesized. Polymer seed with a low degree of crosslinking instead of linear polymer could also be used to prepare monodisperse porous polymer particles with smaller pore volume and pore size.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300208
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    Paper (German National Licenses)
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