Thermally conductive molded article and method of making the same
First Claim
1. A thermally conductive molded article having the shape of a sheet and produced by molding a conductive composition into a predetermined shape, the composition comprising:
- a polymer matrix; and
carbon powders, wherein the carbon powders are obtained by (1) pulverizing or cutting a polymeric material and then graphitizing the polymeric material or (2) graphitizing a polymeric material via heating and then pulverizing or cutting the graphitized material, the polymeric material having an aromatic ring on its main chain;
wherein, the carbon powders have a hexagonal graphite crystal structure; and
the carbon powders and the graphite planes of the hexagonal graphite crystal structure are aligned in the polymer matrix in the direction perpendicular to the molded article sheet.
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Abstract
A thermally conductive molded article is produced by molding a conductive composition into a predetermined shape. The composition includes a polymer matrix and carbon powders. The carbon powders are obtained by graphitizing a polymeric material that has an aromatic ring on its main chain by heating. The carbon powders are aligned in a certain direction in the polymer matrix. Thus, the molded article can be produced easily and effectively that has excellent thermal conductivity in a given direction and that is suitable for use as a heat radiator, heat transfer member, or a component thereof in electronic hardware.
58 Citations
10 Claims
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1. A thermally conductive molded article having the shape of a sheet and produced by molding a conductive composition into a predetermined shape, the composition comprising:
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a polymer matrix; and carbon powders, wherein the carbon powders are obtained by (1) pulverizing or cutting a polymeric material and then graphitizing the polymeric material or (2) graphitizing a polymeric material via heating and then pulverizing or cutting the graphitized material, the polymeric material having an aromatic ring on its main chain; wherein, the carbon powders have a hexagonal graphite crystal structure; and
the carbon powders and the graphite planes of the hexagonal graphite crystal structure are aligned in the polymer matrix in the direction perpendicular to the molded article sheet.- View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of making a thermally conductive molded article having the shape of a sheet, the method comrising:
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providing a thermally conductive composition including a polymer matrix and carbon powders, wherein the carbon powders are obtained (1) pulverizing or cutting a polymeric material and then graphitizing the polymeric material or (2) graphitizing a polymerte material via heating and then pulverizing or cutting the graphitized material, the polymeric material having an aromatic ring on its main chain; applying a magnetic field to the composition so that the carbon powders are aligned in a certain direction in the polymer matrix; and hardening the composition with the carbon powders aligned in the certain direction; wherein the carbon powders have a hexagonal graphite crystal structure; and
the carbon powders and the graphite planes of the gexagonal graphite crystal structure are alignein the polymer matrix in the direction perpendicular to the molded article sheet.- View Dependent Claims (8, 9, 10)
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Specification