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6678 results about "Polyimide" patented technology

Polyimide (sometimes abbreviated PI) is a polymer of imide monomers. Polyimides have been in mass production since 1955. With their high heat-resistance, polyimides enjoy diverse applications in roles demanding rugged organic materials, e.g. high temperature fuel cells, displays, and various military roles. A classic polyimide is Kapton, which is produced by condensation of pyromellitic dianhydride and 4,4'-oxydianiline.

Composite materials comprising polar polymers and single-wall carbon nanotubes

The invention relates to a composite comprising a weight fraction of single-wall carbon nanotubes and at least one polar polymer wherein the composite has an electrical and/or thermal conductivity enhanced over that of the polymer alone. The invention also comprises a method for making this polymer composition. The present application provides composite compositions that, over a wide range of single-wall carbon nanotube loading, have electrical conductivities exceeding those known in the art by more than one order of magnitude. The electrical conductivity enhancement depends on the weight fraction (F) of the single-wall carbon nanotubes in the composite. The electrical conductivity of the composite of this invention is at least 5 Siemens per centimeter (S/cm) at (F) of 0.5 (i.e. where single-wall carbon nanotube loading weight represents half of the total composite weight), at least 1 S/cm at a F of 0.1, at least 1×10−4 S/cm at (F) of 0.004, at least 6×10−9 S/cm at (F) of 0.001 and at least 3×10−16 S/cm (F) plus the intrinsic conductivity of the polymer matrix material at of 0.0001. The thermal conductivity enhancement is in excess of 1 Watt/m-° K. The polar polymer can be polycarbonate, poly(acrylic acid), poly(acrylic acid), poly(methacrylic acid), polyoxide, polysulfide, polysulfone, polyamides, polyester, polyurethane, polyimide, poly(vinyl acetate), poly(vinyl alcohol), poly(vinyl chloride), poly(vinyl pyridine), poly(vinyl pyrrolidone), copolymers thereof and combinations thereof. The composite can further comprise a nonpolar polymer, such as, a polyolefin polymer, polyethylene, polypropylene, polybutene, polyisobutene, polyisoprene, polystyrene, copolymers thereof and combinations thereof.

Method for manufacturing high thermal conductivity graphite film

The invention discloses a method for manufacturing a high thermal conductivity graphite film, which adopts polyimide films as raw materials and is formed through two processes of carbonization and graphitization. The technological processes of the high thermal conductivity graphite film comprise the steps as follows: a, the polyimide films are selected as the raw materials, and a piece of graphite paper is clamped between each layer of the polyimide films; b, the polyimide films which are provided with the graphite paper at intervals, crossed and stacked are placed into a carbonization furnace to be carbonized in an environment of nitrogen or argon, the carbonized temperature ranges from 1000 DEG C to 1400 DEG C, and the time is controlled from 1 hour to 6 hours; and c, after the carbonization, the graphitization is performed also in the environment of nitrogen or argon, the temperature is controlled in a range from about 2500 DEG C to 3000 DEG C, and the time is controlled within 12 hours. The method for manufacturing the high thermal conductivity graphite film has a simple manufacturing process, the high heat dissipation capacity of the graphite film is guaranteed, the bending-resistant performance is enhanced, and a requirement for a thin and light electronic product of a consumer is met to a certain extent.
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