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  • 1
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    Polyimide matrix resins for up to 700 deg F service (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: TRW is in the process of data accumulation that strongly indicates that incorporation of the perfluorsisopropylidene linkage in molecular structures other than those employed in DU Pont's NR-150B polyimides likewise yield polymers demonstrating extremely high thermo-oxidative stability. Polyimide synthetic and characterization studies conducted to date on new polymers incorporating the perfluoroisopropylidene linkage are presented and discussed.
    Keywords: COMPOSITE MATERIALS
    Type: NASA. Lewis Research Center High Temp. Polymer Matrix Composites; p 271-285
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of partially fluorinated resin apex seals (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Partially fluorinated polyimides were prepared and molded in the form of discs and pins for test as potential apex seal materials for advanced rotary combustion engines. The polyimides were formulated from the diamine 2,2-bis 4-(4-aminophenoxy)phenyl hexafluoropropane (4-BDAF) and the dianhydrides of pyromellitic acid (PMDA) and benzophenonetetracarboxylic acid (BTDA). Tribological testing was performed at sliding speeds of 0.31 to 11.6 m/s and at temperatures of from 298K to 573K. It is shown that the carbon fiber filled polyimides, particularly the 80/20 compositions, have an excellent balance of wear/friction at 573K. The unfilled, 80/20 and 60/40 compositions indicate an unusual combination of high friction and low wear which may be advantageous in such applications as brakes and traction drives.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-174706 , NAS 1.26:174706 , TRW-38603-6009-UT-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Improved high-temperature resistant matrix resins (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A study was performed with the objective of developing matrix resins that exhibit improved thermo-oxidative stability over state-of-the-art high temperature resins for use at temperatures up to 644 K (700 F) and air pressures up to 0.7 MPa (100 psia). The work was based upon a TRW discovered family of polyimides currently licensed to and marketed by Ethyl Corporation as EYMYD(R) resins. The approach investigated to provide improved thermo-oxidative properties was to use halogenated derivatives of the diamine, 2, 2-bis (4-(4-aminophenoxy)phenyl) hexafluoropropane (4-BDAF). Polyimide neat resins and Celion(R) 12,000 composites prepared from fluorine substituted 4-BDAF demonstrated unexpectedly lower glass transition temperatures (Tg) and thermo-oxidative stabilities than the baseline 4-BDAF/PMDA polymer.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-180826 , NAS 1.26:180826
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Feasibility study for the development of low temperature curing adhesives (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The feasibility of a new approach for the development of stable, easily handled, room temperature (293 K - 311 K) curing adhesives was studied and demonstrated. The work concentrated on a family of unsaturated amide/ester resins. Twelve candidate resins were synthesized and tested for completeness of cure at room temperature, adhesion to aluminum and titanium, shear strength, moisture resistance and heat stability. The three most promising candidate resins were selected and recommended for further development.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-CR-132422 , TRW-22743-6009-RU-00
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    NASA TECHNICAL REPORTS
  • 5
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    The development of low temperature curing adhesives (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An approach for the development of a practical low temperature (293 K-311 K/68 F-100 F) curing adhesive system based on a family of amide/ester resins was studied and demonstrated. The work was conducted on resin optimization and adhesive compounding studies. An improved preparative method was demonstrated which involved the reaction of an amine-alcohol precursor, in a DMF solution with acid chloride. Experimental studies indicated that an adhesive formulation containing aluminum powder provided the best performance when used in conjunction with a commercial primer.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-132751 , TRW-26415-6015-RU-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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