General Electric Company

Lisa Vinciguerra Shafer

Warren Rosal Ronk

Stephen Mark Whiteker

Todd Aaron Bullions

A method for forming a polyimide composite article utilizes a polyimide resin system including at least a first prepolymer component and a second prepolymer component. A preform structure is tackified with the first prepolymer component. Using resin infusion or resin transfer molding techniques, the tackified preform structure is contacted with the second prepolymer component. The polyimide resin system is cured under suitable cure conditions so that the first and second prepolymer components mix and react to produce the polyimide composite structure.

Methods for forming composite articles from tailorable polyimide resin systems using RTM and RI techniques

Tailorable polyimide resin systems suitable for processing by resin transfer molding (RTM) and resin infusion (RI) methods. An exemplary resin system includes first and second prepolymer components present in respective amounts to provide the desired processibility. The cured polyimide system exhibits high glass transition temperature and other properties required for gas turbine engine applications. The first and second prepolymer components independently comprise a monomeric mixture or a reaction product of a diamine component, a dianhydride component, and an end group component.

RTM and RI processible tailorable polyimide resin systems and composite articles formed therefrom

A tailorable polyimide prepolymer blend comprising an end group component, a dianhydride component, and a diamine component. The dianhydride component includes at least 3,4,3',4&#x2032;-benzophenonetetracarboxylic dianhydride (BTDA), derivatives thereof, or combinations thereof, and 3,4,3&#x2032;,4&#x2032;-biphenyltetracarboxylic dianhydride (BPDA), derivatives thereof, or combinations thereof. The diamine component includes at least 1,3-phenylenediamine (mPDA), derivatives thereof, or combinations thereof; 1,4-phenylenediamine (pPDA), derivatives thereof, or combinations thereof; bis amino phenoxy benzene (APB), derivatives thereof, and combinations thereof; and optionally, 4,4&#x2032;-(1,3-phenylene-bis(1-methylethylidene)bisaniline (Bis-M), derivatives thereof, and combinations thereof. A cured polyimide matrix has a glass transition temperature of at least about 450&#xb0; F. (232&#xb0; C.). An article formed from the tailorable polyimide prepolymer blend may be a powder, a neat resin, a coating material, a film, an adhesive, a fiber, a composite, a laminate, a prepreg, a part, and combinations thereof.

Tailorable polyimide prepolymer blends, crosslinked polyimides, and articles formed therefrom

A tailorable polyimide resin system may be used to form an organic matrix composite (OMC) structure for use in high temperature applications. A thermal oxidative barrier coating on the OMC may include a bond coat comprising a tailorable polyimide resin system. The bond coat may include nano-particles such as clay platelets, graphite flakes or a polyhedral oligomeric silsesquioxane. The coating system may include a thermal barrier layer including a silsesquioxane or an inorganic polymer. The tailorable polyimide resin system includes first and second independent prepolymer components able to impart desired properties in the prepolymer blend or the crosslinked polyimide matrix.

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Cincinnati, OH, United States of America

Lisa Vinciguerra Shafer