Accession Number : ADD017447

Title :   Phthalonitrile Prepolymer as High Temperature Sizing Material for Composite Fibers.

Descriptive Note : Patent, Filed 28 Jun 93, patented 14 Feb 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Keller, Teddy M

Report Date : 14 Feb 1995

Pagination or Media Count : 6

Abstract : Sized fibers, for use as reinforcements in high temperature polymeric composites, are prepared by coating the outside surface of the fibers with an amorphous, B-stage bisphthalonitrile prepolymer. The prepolymer may be prepared by curing a bisphthalonitrile monomer with an organic amine, an aromatic organic acid, a mineral acid, a Lewis acid or a salt of any of the above. Then, the fibers are coated by passage through an organic solution of the prepolymer. Either before or after completely curing the prepolymer coating on the fibers, the coated fibers are covered with a resin, for example, by passage through a solution or melt of a polyimide or bisphthalonitrile resin. If the phthalonitrile coating was incompletely cured prior to covering the phthalonitrile-coated fiber with the resin, the heat during the subsequent cure of the resin also completely cures the phthalonitrile coating. The resulting composite has excellent high temperature properties. In a preferred embodiment, the coated fibers are used to form a prepreg for usage in composite fabrication. jg

Descriptors :   *FIBERS, *POLYMERS, *COMPOSITE MATERIALS, *HIGH TEMPERATURE, *PATENTS, FIBER REINFORCED COMPOSITES, SURFACES, COATINGS, AMINES, SOLUTIONS(GENERAL), AROMATIC COMPOUNDS, MINERALS, ACIDS, POLYIMIDE RESINS, ORGANIC ACIDS

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE