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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of MBS emulsion particles in immiscible polystyrene/SAN blends (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 225-232 
    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: The effect of mixing technique and sequence on the distribution of methacrylated-butadienestyrene (MBS) emulsion particles in immiscible blends of polystyrene (PS) and a styrene/acrylonitrile copolymer (SAN) was examined using transmission electron microscopy. The shell of the emulsion particle is essentially poly(methyl methacrylate) (PMMA), which is miscible with SAN but immiscible with PS. In simple thermodynamic terms, the MBS particle should have an affinity for SAN over PS. It was found, however, that the sequence of mixing had a strong influence on the location of the MBS particles. If the PS-SAN interface is established before the addition of the MBS particles, the MBS particles are located exclusively in the SAN phase. If the MBS particles are present at the time the PS-SAN interface is formed, then the particles line up at the interface.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370117
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical behavior of dual-rubber-modified SAN (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 1563-1571 
    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: The use of either an SBS block copolymer or an emulsion-made methyl-methacrylate-grafted rubber alone failed to give any significant increase in the toughness of brittle poly(styrene-co-acrylonitrile) (SAN), even at concentrations up to 50%. However, a combination of the two rubber modifiers produced a strong synergistic toughening. All specimens were prepared by injection molding; however, annealing to relax orientation did not significantly alter this synergistic effect. The use of mechanical dilatometry showed that post-yield deformation of blends containing both modifiers involved some crazing just after yielding but subsequent deformation was mostly due to shear yielding. Addition of SBS alone to SAN resulted in a mixed crazing/shear yielding mode of post-yield deformation with the relative proportions of the two mechanisms being constant up to failure. In contrast, the small emulsion graft particles alone gave rise to a predominant shear yielding deformation. A qualitative mechanism for the synergism is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350613
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Blends of imidized acrylic polymers with SAN copolymers and with PVC (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 513-525 
    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: A series of imidized acrylic polymers of varying structural composition generated by reaction of methylamine with poly(methyl methacrylate) were blended with a range of styrene/acrylonitrile or SAN copolymers (0-33% AN) and with poly(vinyl chloride). On the basis of glass transition behavior determined by differential scanning calorimetry, some but not all imidized acrylic structures were found to be miscible with PVC and with SAN copolymers within a limited window of AN levels. Acid functionality in the imidized acrylics appears to hinder their miscibility with SAN rather significantly and with PVC to a lesser extent. Miscible SAN blends showed lower critical solution temperature behavior whereas miscible blends with PVC did not up to the highest attainable temperatures. The composition factors that influence the phase behavior are described and interpreted in terms of possible mechanisms.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370217
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  • 4
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    Contamination of spacecraft by recontact of dumped liquids (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Liquids partially freeze when dumped from spacecraft producing particles which are released into free space at various velocities. Recontact of these particles with the spacecraft is possible for specific particle sizes and velocities and, therefore, can become contamination for experiments within the spacecraft or released experiments as a result of waste and potable water dumped from Space Shuttle. An examination of dump characteristics was conducted on STS-29 using both on-board video records and ground based measurements. A preliminary analysis of data from this flight indicates particle velocities are in the range of 30 to 75 ft/sec and recontact is possible for limited particle sizes.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Third Annual Workshop on Space Operations Automation and Robotics (SOAR 1989); p 99-104
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Overview of Heatshield for Extreme Entry Environment Technology (HEEET) (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Space Transportation and Safety
    Type: ARC-E-DAA-TN53581 , International Planetary Probe Workshop; Jun 09, 2018 - Jun 15, 2018; Boulder, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Overview of Heatshield for Extreme Entry Environment Technology (HEEET) (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-08
    Description: The objective of the Heatshield for Extreme Entry Environment Technology (HEEET) projects is to mature a 3-D Woven Thermal Protection System (TPS) to Technical Readiness Level (TRL) 6 to support future NASA missions to destinations such as Venus and Saturn. Destinations that have extreme entry environments with heat fluxes 〉 3500 W/sq cm and pressures up to 5 atmospheres, entry environments that NASA has not flown since Pioneer-Venus and Galileo. The scope of the project is broad and can be split into roughly four areas, Manufacturing/Integration, Structural Testing and Analysis, Thermal Testing and Analysis and Documentation. Manufacturing/Integration covers from raw materials, piece part fabrication to final integration on a 1-meter base diameter 45-degree sphere cone Engineering Test Unit (ETU). A key aspect of the project was to transfer as much of the manufacturing technology to industry in preparation to support future mission infusion. The forming, infusion and machining approaches were transferred to Fiber Materials Inc. and FMI then fabricated the piece parts from which the ETU was manufactured.
    Keywords: Spacecraft Design, Testing and Performance
    Type: ARC-E-DAA-TN67635 , International Conference on Flight Vehicles, Aerothermodynamics and Re-entry Missions & Engineering (FAR) 2019; Sep 30, 2019 - Oct 03, 2019; Monopoli; Italy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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