Method of improving adhesion of carbon fibers with a polymeric matrix
First Claim
1. A method of making a solid composite containing carbon fibers embedded in a polymeric matrix, the method comprising admixing carbon fibers with an unsaturated polymer precursor resin containing carbon-carbon double bonds, and curing the polymer precursor resin to form a cured polymeric matrix that contains said carbon fibers embedded therein, wherein said carbon fibers admixed with the unsaturated polymer precursor resin have covalently bonded on their surfaces a partially cured sizing agent comprised of an epoxy resin, wherein said epoxy resin is covalently attached to a linking group that contains an accessible unsaturated group that reacts with said carbon-carbon double bonds in the unsaturated polymer precursor resin via a vinyl addition reaction, and at least some epoxide groups in the sizing agent are available as uncrosslinked epoxide groups, which corresponds to a curing degree of epoxide groups of no more than about 0.6.
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Abstract
A method of making a solid composite containing carbon fibers embedded in a polymeric matrix, the method comprising admixing carbon fibers with a polymer precursor resin, and curing the polymer precursor resin to form a cured polymeric matrix that contains said carbon fibers embedded therein, wherein said carbon fibers have covalently bonded on their surfaces a partially cured epoxy-containing or amine-containing sizing agent, wherein at least a portion of epoxide groups or amine groups in the sizing agent are available as uncrosslinked epoxide groups or amine groups, which corresponds to a curing degree of epoxide groups or amine groups of no more than about 0.6.
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Citations
15 Claims
- 1. A method of making a solid composite containing carbon fibers embedded in a polymeric matrix, the method comprising admixing carbon fibers with an unsaturated polymer precursor resin containing carbon-carbon double bonds, and curing the polymer precursor resin to form a cured polymeric matrix that contains said carbon fibers embedded therein, wherein said carbon fibers admixed with the unsaturated polymer precursor resin have covalently bonded on their surfaces a partially cured sizing agent comprised of an epoxy resin, wherein said epoxy resin is covalently attached to a linking group that contains an accessible unsaturated group that reacts with said carbon-carbon double bonds in the unsaturated polymer precursor resin via a vinyl addition reaction, and at least some epoxide groups in the sizing agent are available as uncrosslinked epoxide groups, which corresponds to a curing degree of epoxide groups of no more than about 0.6.
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