Fabrication and Properties of Polyimide-Based Graphite Fibers

Some polyimide(PI)-based carbon fibers and films have been reported, even with high precursor costs. PI, as a precursor, exhibited high carbon yield and extremely high thermal and electrical conductivities when carbonized and graphitized. PI fibers were prepared by the wet spinning of polyamic acid and subsequent thermal imidization. The fibers were carbonized in the presence of poly(dimethyl siloxane) (PDMS) and poly(methyl phenyl siloxane) (PMPS) and finally graphitized at 2,200 oC. The addition of PDMS and PMPS altered the pyrolysis behavior and residue of the PI fibers. PDMS pretreatment improved the tensile strength and electrical conductivity of the resultant carbon fibers. Another important effect of PDMS was that the carbon fibers with PDMS were more flexible and much softer than the PI fibers.

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Fabrication and Properties of Polyimide-Based Graphite Fibers

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