C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/306, 400/503
C07D 207/448 (2006.01) C07D 209/48 (2006.01) C07D 209/76 (2006.01) C07D 491/18 (2006.01) C07D 495/18 (2006.01) C08J 5/06 (2006.01)
Patent
CA 2021895
AMIDEIMIDE OLIGOMERS, BLENDS AND SIZINGS FOR CARBON FIBER COMPOSITES ABSTRACT The thermooxidative stability and thermomechanical properties of advanced composites which use high performance resin matrices such as polyimides and high strength carbon fibers may be improved by sizing the carbon fibers with un- capped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: Image Wherein R2 = a trivalent organic radical and generally benzenetriyl; R3 = a divalent organic radical; and n = an integer sufficiently large to provide a strong, tough coating. Useful capped, linear polyamideimide oligomers may be formed by including end caps with an unsaturated functionality (Y) containing a residue selected from the group consisting of: Image , Image , Image , Image , Image , or Image wherein R1 = lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof; j = 0, 1, or 2; i = 1 or 2; G = -CH2-, -O-, -S-, -SO2-, -SO-, -CO-, -CHR-, or -CR2-; T = methallyl or allyl; Me = methyl; and R = hydrogen, lower alkyl, or phenyl. Prepregs and composites having carbon fibers sized with such polyamideimides are also described.
Lubowitz Hyman R.
Sheppard Clyde H.
Stephenson Ronald R.
Boeing Company (the)
Lubowitz Hyman R.
Sheppard Clyde H.
Smart & Biggar
Stephenson Ronald R.
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