Oriented graphite film, methods of manufacture thereof and articles comprising the same
AssigneeInternational Business Machines Corporation
InventorsKuniaki Sueoka, Yoichi Taira
Life of this patent
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Abstract
Disclosed herein is a composite film comprising an organic polymer film; the organic polymer film having an elastic modulus of less than or equal to about 105 gigapascals when measured at room temperature; and a bundle of carbon fibers disposed in the organic polymer film; each bundle comprising a column and an end face; each bundle also having a longitudinal axis that is substantially parallel to the column and passes through the center of the column; the end face being fibrillated so as to have a surface area measured perpendicular to the longitudinal axis that is about 110 to about 250% greater than the surface area of a cross-section of the carbon fiber measured at the column.
Claims1
A method comprising:
- fabricating carbon fiber bundles from chopped carbon fibers;
- disposing the chopped carbon fibers in a mold;
- disposing an organic polymer into the mold;
- immersing the chopped carbon fibers in the organic polymer to form immersed chopped carbon fibers;
- pressurizing the immersed chopped carbon fibers in the mold;
- annealing the immersed chopped carbon fibers to form a carbon fiber block;
- slicing the carbon fiber block to form a plurality of carbon fiber sheets;
- each carbon fiber sheet having a longitudinal axis that is substantially parallel to respective carbon fibers in the bundle;
- intercalating an end face of a carbon fiber bundle in the carbon fiber sheet with nitrate ions;
- the intercalating being conducted by immersing the carbon fiber sheet into an electrolytic bath comprising nitric acid;
- illuminating the end face of the carbon fiber bundle with a pulse laser;
- and
- fibrillating the end face of the carbon fiber bundle to form a composite film.
Dependencies are inferred from the claim text.