Fibers sized with a coating of amorphous polyetherketoneketone are useful in the preparation of reinforced polymers having improved properties, wherein the amorphous polyetherketoneketone can improve the compatibility of the fibers with the polymeric matrix.
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1. A sized fiber comprising a fiber having a coating of amorphous polyetherketoneketone, said coating comprising about 0.01 to about 10% by weight of the amount of coating in the sized fiber and having a thickness of about 1 micron to about 50 microns, and wherein said coating continuously surrounds
1. A sized fiber comprising a fiber having a coating of amorphous polyetherketoneketone, said coating comprising about 0.01 to about 10% by weight of the amount of coating in the sized fiber and having a thickness of about 1 micron to about 50 microns, and wherein said coating continuously surrounds said fiber surfaces, and wherein the amorphous polyetherketoneketone is comprised of repeating units represented by formulas I and II: -A-C(═O)—B—C(═O)— I-A-C(═O)-D-C(═O)— IIwherein A is a p,p′-Ph-O-Ph- group, Ph is a phenylene radical, B is p-phenylene, and D is m-phenylene and the isomer ratio of formula I:formula II (T:I) ranges from about 55:45 to about 65:35. 2. The sized fiber of claim 1, wherein said fiber is a monofilament. 3. The sized fiber of claim 1, wherein said fiber is a multifilament. 4. The sized fiber of claim 1, wherein said fiber has a diameter of about 50 microns to about 1 mm. 5. The sized fiber of claim 1, wherein said fiber is selected from the group consisting of glass fibers, carbon fibers, mineral fibers, metal fibers and polymeric fibers. 6. A reinforced polymer comprising a polymer matrix and sized fibers of claim 1. 7. The reinforced polymer of claim 6, wherein said polymer matrix is comprised of one or more thermoplastics selected from the group consisting of polyaryletherketones (PAEK), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polyetheretheretherketone (PEEEK), polyetheretherketoneketone (PEEKK), polyetherketoneetheretherketone (PEKEKK), polyetherketoneketoneketone (PEKKK)), polyimides, polyetherimides, polyamideimides, polysulfones, polyethersulfones, polyarylethers, polycarbonates, liquid crystal polymers, polyphenylene sulfides, polyarylenes (polyphenylenes), polyamides, polyphthalamides, and polyaromatic esters. 8. The reinforced polymer of claim 6, wherein said polymer matrix is comprised of a crystalline poly(aryletherketone). 9. A method of making a sized fiber, said method comprising coating a fiber with a sizing composition comprising amorphous polyetherketoneketone, said coating comprising about 0.01 to about 10% by weight of the amount of coating in the sized fiber and having a thickness of about 1 micron to about 50 microns, wherein said coating continuously surrounds said fiber surfaces, and wherein the amorphous polyetherketoneketone is comprised of repeating units represented by formulas I and II: -A-C(═O)—B—C(═O)— I-A-C(═O)-D-C(═O)— IIwherein A is a p,p′-Ph-O-Ph- group, Ph is a phenylene radical, B is p-phenylene, and D is m-phenylene and the isomer ratio of formula I:formula II (T:I) ranges from about 55:45 to about 65:35.
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