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  • 1
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    A new antifoaming agent for epoxy material processing (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It has been found that fluorodiepoxides are effective antifoaming agents for epoxy processing when applied at a level as low as 0.1 to 0.2 percent, and there is no adverse effect on the properties of the cured products. The novelty of the fluorodiepoxide is that it is reactive and can copolymerize with a conventional epoxy resin at the same time in the same way in forming an inter-crosslinked polymer network. However, when applied at a high level, compatibility problems may prevail.
    Keywords: NONMETALLIC MATERIALS
    Type: SAMPE Quarterly (ISSN 0036-0821); 22; 52-57
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Thermomechanical properties of polymeric materials and related stresses (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The thermomechanical analysis (TMA) and dynamic mechanical analysis characterizations of a polymeric material yield useful data relating to the thermomechanical stresses of eight widely used polymeric materials. The materials encompass Lexan, Plexiglass, Epon, Conap, Uralane, Solithane, and Humiseal. A combined profile of the coefficient of thermal expansion (CTE) and the modulus change over a wide temperature range obtained by these analytical methods indicates the drastic effects of glass transition on both the CTE and the modulus of a polymer. TMA can also detect secondary transitions, and provides a convenient means for the study of a polymer's toughness.
    Keywords: NONMETALLIC MATERIALS
    Type: SAMPE Quarterly (ISSN 0036-0821); 21; 48-51
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Cyanoresin, cyanoresin/cellulose triacetate blends for thin film, dielectric capacitors (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Non-brittle dielectric films are formed by blending a cyanoresin such as cyanoethyl, hydroxyethyl cellulose (CRE) with a compatible, more crystalline resin such as cellulose triacetate. The electrical breakdown strength of the blend is increased by orienting the films by uniaxial or biaxial stretching. Blends of high molecular weight CRE with high molecular weight cyanoethyl cellulose (CRC) provide films with high dielectric constants.
    Keywords: NONMETALLIC MATERIALS
    Type: NAS 1.71:NPO-18913-1-CU
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Thermomechanical properties of polymeric materials and related stresses (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The thermomechanical properties of a number of widely used polymeric materials were determined by thermomechanical analysis and dynamic mechanical analysis. A combined profile of the coefficient of thermal expansion and the modulus change over a wide temperature range obtained by the analyses shows clearly the drastic effect of the glass transition on both the CTE and the modulus of a polymer, and the damaging potential due to such effect.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-100758 , REPT-90B00071 , NAS 1.15:100758
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Biaxially Stretched Polycarbonate Film For Capacitors (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report describes experiments on effects of biaxial stretching on crystal structures, dielectric properties, and sellected thermal and mechanical properties of biaxially stretched polycarbonate films. Highest stretch ratios produce highest degree of crystallinity, with single crystalline phase and distribution of crystallites more nearly isotropic than uniaxially oriented film. Electrical properties at high temperatures improved.
    Keywords: MATERIALS
    Type: NPO-18090 , NASA Tech Briefs (ISSN 0145-319X); 16; 9; P. 78
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Improved Dielectric Films For Capacitors (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Dielectric films made from blends of some commercially available high-dielectric-constant cyanoresins with each other and with cellulose triacetate (CTA) have both high dielectric constants and high breakdown strengths. Dielectric constants as high as 16.2. Films used to produce high-energy-density capacitors.
    Keywords: MATERIALS
    Type: NPO-18913 , NASA Tech Briefs (ISSN 0145-319X); 18; 7; P. 54
    Format: text
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    NASA TECHNICAL REPORTS
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