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There are a total of 17 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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High temperature adhesives
Author(s): St.clair, Terry L.
Abstract: The aerospace and electronics industries have an ever increasing need for higher performance materials. In recent years, linear aromatic polyimides have been proven to be a superior class of materials for various ...
NASA Center: Langley Research Center
Publication Year: 1991
Added to NTRS: 2008-06-01
Accession Number: 92N22460; Document ID: 19920013217
Physical aging and solvent effects on the fracture of LaRC-TPI adhesives
Author(s): Dillard, David A.; St.clair, Terry L.; Johnson, W. Steven
Abstract: When amorphous materials are quenched below their glass transition temperature, excess enthalpy is trapped in the glassy material because the viscosity is too great to allow the material to remain in volumetric equilibrium. ...
NASA Center: Langley Research Center
Publication Year: 1992
Added to NTRS: 2008-06-01
Accession Number: 93N16766; Document ID: 19930007577
The mechanical stability of polyimide films at high pH
Author(s): Croall, Catharine I.; St.clair, Terry L.
Abstract: Polyimide insulated electrical wire has been widely used in the aerospace industry in commercial, military, and to a lesser degree, general aviation aircraft since the early 1970s. Wiring failures linked to insulation damage ...
NASA Center: Langley Research Center
Publication Year: 1990
Added to NTRS: 2008-04-01
Accession Number: 91N11920; Document ID: 19910002607; Report Number: NAS 1.15:102726, NASA-TM-102726
Soluble aromatic polyimides for film and coating applications
Author(s): St.clair, Anne K.; St.clair, Terry L.
Abstract: Linear all-aromatic polyimides have been synthesized and characterized which show much potential as films and coatings for electronic applications. Structure-property relations with regard to methods for obtaining solubility ...
NASA Center: Langley Research Center
Publication Year: 1986
Added to NTRS: 2005-10-13
Accession Number: 87N16911; Document ID: 19870007478; Report Number: NAS 1.15:89016, NASA-TM-89016
Low-energy positron flux generator for microstructural characterization of thin films
Author(s): Singh, Jag J.; Eftekhari, Abe; St.clair, Terry L.
Abstract: A slow positron flux generator using well annealed polycrystalline tungsten moderators and a Na-22 positron source was developed for microstructural characterization of thin insulator (ceramics and polymeric) films. A 250 ...
NASA Center: Langley Research Center
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N22538; Document ID: 19910013225; Report Number: L-16881, NAS 1.60:3074, NASA-TP-3074
Flexibilized copolyimide adhesives
Author(s): Progar, Donald J.; St.clair, Terry L.
Abstract: Two copolyimides, LARC-STPI and STPI-LARC-2, with flexible backbones were processed and characterized as adhesives. The processability and adhesive properties were compared to those of a commercially available form of ...
NASA Center: Langley Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 88N13474; Document ID: 19880004092; Report Number: NAS 1.15:89303, NASA-TM-89303
Free-volume characteristics of epoxies
Author(s): Singh, Jag J.; Eftekhari, Abe; Shultz, William J.; St.clair, Terry L.
Abstract: Positron annihilation spectroscopy was used to measure free-volume characteristics of selected epoxies. Fluorene resins, a new family of high-temperature thermosetting resins, were selected as the test medium. Experimental ...
NASA Center: Langley Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N33617; Document ID: 19920024373; Report Number: L-17104, NAS 1.15:4390, NASA-TM-4390
A study of thermal transitions in a new semicrystalline thermoplastic polyimide
Author(s): Pratt, J. Richard; St.clair, Terry L.; Gerber, Margaret K.; Gautreaux, Carol R.
Abstract: A polyimide derive from 4,4'-isophthaloyl diphthalic anhydride (IDPA) and 1,3-bis (4-aminophenoxy 4'-benzoyl) benzene (1,3-BABB) having semicrystalline behavior was prepared and characterized by differential scanning ...
NASA Center: Langley Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 89N18549; Document ID: 19890009178; Report Number: NAS 1.15:101526, NASA-TM-101526
The mechanical properties of polyimide films after exposure to high pH
Author(s): Croall, Catharine I.; St.clair, Terry L.
Abstract: Wiring failures linked to insulation damage have drawn much attention in the aerospace industry and concerns have developed regarding the stability and safety of polyimide insulated electrical wire. Several polyimides were ...
NASA Center: Langley Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N22666; Document ID: 19920013423; Report Number: NAS 1.15:104202, NASA-TM-104202
Investigation of microstructural changes in polyetherether-ketone films at cryogenic temperatures by positron lifetime spectroscopy
Author(s): Singh, Jag J.; Eftekhari, Abe; St.clair, Terry L.; Sprinkle, Danny R.
Abstract: Microstructural changes in Polyetherether-ketone (PEEK) films were investigated in the temperature ranges of 23 to -196 C, using Positron Lifetime Spectroscopy (PLS) technique. It was determined that the total free volume ...
NASA Center: Langley Research Center
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 91N18216; Document ID: 19910008903; Report Number: L-16841, NAS 1.60:3064, NASA-TP-3064
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