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Carbon fiber (CF) has outstanding mechanical, thermal, and electric characteristics, and it has strong anisotropy. To take advantage of the enhanced properties, the orientation control of CFs should be important. In recent years, the aligned carbon nanotube (CNT) /polymer composites have been produced by the application of high magnetic field. However, there are few reports about magnetically oriented CF/polymer composites. We have performed the magnetic processing of polymer composite films including CFs by using our magnetic processing machine (0.9 T) with permanent magnets, and a commercially available superconductive magnet (10 T). We have studied the orientation of CFs along the thickness direction of the film. The orientational distribution of CFs was analyzed by three dimensional optical microscope analysis in addition to X-ray diffraction. It was demonstrated that the oriented CF/polymer composite films were produced even by permanent magnets. The electric resistance of the film (vertically oriented CFs, 10wt.%), after magnetic processing (0.9T), was improved by the order of 109Ω·cm. It was also found that the film showed anisotropic electric property.

Magnetic processing of polymer composite films including carbon fibers