Title High Temperature Finishes for Polyimide Matrix Composites
Source Proc. 52nd Intl. SAMPE Symp. and Exhib.
Year 2007
Author(s) Allred, R. E.; Hoyt Haight, A. E.; Gosau, J. M.; Barlow, J. Pl
Abstract High-temperature polymer matrix composites (PMCs) are used for a variety of jet engine parts, including the fan case, stators, fan ducts, augmentor ducts, external flaps, the lift fan system, the fan inlet case, roll posts, and engine-airframe integration parts. These parts amount to 600 to 1000 pounds per engine. The current baseline composite system for the joint strike fighter (JSF) engine is T650-35 carbon fiber with HTS sizing in an AFR-PE-4 fluorinated polyimide matrix. There are several problems with the current fiber-sizing combination, including lack of adequate protection of the fibers during weaving, poor property translation in the composite, poor fiber/matrix interfacial adhesion, and poor wetting during prepregging and composite processing. A new fiber-sizing combination is needed to alleviate the problems with the current baseline material. Such a development will result in lowering costs while improving overall performance. Adherent Technologies, Inc. is developing a new, more compatible sizing (finish) for T650-35/AFR-PE-4 composites. Interfacial mechanical property data as well as the performance of the new fiber finish system in accelerated thermo-oxidative aging experiments will be discussed.
Keywords high-temperature, polyimide matrix, composites, AFR-PE-4, interface, interfacial adhesion, prepreg, prepregging

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