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High Performance Polymers
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6F-Polyimides with Phenylethynyl Endcap for 315-370 °C Applications

Kathy C. Chuang

NASA Glenn Research Center, Cleveland, OH 44135, USA

Cheryl L. Bowman

NASA Glenn Research Center, Cleveland, OH 44135, USA

Thomas K. Tsotsis

Boeing Phantom Works, Huntington Beach, CA 92647, USA

Cory P. Arendt

Boeing Phantom Works, Huntington Beach, CA 92647, USA

6F-Polyimides with a phenylethynyl endcap (HFPE) were fabricated into carbon fiber composites using the standard polymerization of monomer reactant (PMR) approach via the ester/acid route. T650-35/HFPE carbon fiber composites were evaluated against the corresponding T650-35/PMR-II-50 composites with nadic endcap at 315-370 °C (600-700 °F) for their physical and mechanical properties as well as thermo-oxidative stability. In addition, concentrated HFPE monomer solutions were infused into stitched AS4 and T650-35 preforms and their mechanical properties were compared with those of the commercial BMI-5270 composites from cryogenic temperature to 343 °C (650 °F). The stitched HFPE composites out-performed BMI-5270 composites in terms of property retention at elevated temperature and microcrack resistance during thermal cycling from –54 to 288 °C (–65 to 550 °F). The stitched composites also showed more resistance toward blistering and delamination than conventional laminate composites during a rapid heating rate simulating launch and re-entry of reusable launch vehicles (RLV).

Key Words: Polyimides • phenylethynyl endcap • resin infusion • thermal cycling • rapid heating

High Performance Polymers, Vol. 15, No. 4, 459-472 (2003)
DOI: 10.1177/0954008303015004005
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 Journal of Composite MaterialsHome page
M. W. Czabaj, A. T. Zehnder, and K. C. Chuang
Blistering of Moisture Saturated Graphite/Polyimide Composites Due to Rapid Heating
Journal of Composite Materials, January 1, 2009; 43(2): 153 - 174.
[Abstract] [PDF]