Toughened fiber-reinforced composites
AssigneeAmoco Corporation
InventorsShahid P. Qureshi, Richard E. Hoffman, Richard H. Newman-Evans
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Abstract
Composites comprising structural fiber and matrix resin formulated from epoxys selected from the group consisting of polyglycidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino- 3-ethylphenyl)methane with from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of a solid aromatic diamine hardener, toughened with porous rigid resin particles having a spheroidal spongy structure. The resulting composites exhibit surprising improvement in interlaminar strength characteristics as measured by G.sub.IC.
Claims18
A composition comprising continuous structural fiber embedded in a matrix resin comprising (a) at least one epoxy resin selected from the group consisting of polyglycidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino-3-ethylphenyl) methane;
- (b) from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of 3,3'-diaminodiphenyl sulfone diamine hardener;
- and (c) porous rigid polyamide particles having a spheroidal spongy structure, a mean diameter in the range of from about 1 to about 75 microns and a specific surface greater than about 5 m.sup.2 /g.
A layered, fiber-reinforced composite comprising continuous structural fiber embedded in a matrix resin comprising (a) at least one epoxy resin selected from the group consisting of polyglycidyl ethers of polycyclic bridged hydroxy-substituted polyaromatic compounds and N,N,N',N'-tetraglycidyl-bis(4-amino-3-ethylphenyl) methane;
- and (b) from about 6 to about 150 pbw, per hundred parts by weight of the epoxy resin components, of 3,3'-diaminodiphenyl sulfone diamine hardener;
- said continuous fiber forming a plurality of discrete plies defining layers comprising said matrix resin having dispersed therein porous rigid polyamide particles having a spheroidal spongy structure, a mean diameter in the range of from about 1 to about 75 microns and a specific surface greater than about 5 m.sup.2 /g.
Dependencies are inferred from the claim text.