화학공학소재연구정보센터
Korean Journal of Chemical Engineering, Vol.16, No.4, 518-524, July, 1999
Isotropic Carbon and Graphite Fibers from Chemically Modified Coal-Tar Pitch
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A precursor for a general purpose carbon fiber was prepared from coal tar pitch (CP) modified with 10% p-benzoquinone (BQ) at 380℃ for 3 hours. Such a modification raised the softening of the pitch from 85℃ to 271℃ at a yield of 43%. The modified pitch was spun smoothly at a rate of 480 m/min into a fiber of 20μm diameter. The fiber was stepwise stabilized at 236℃ (5℃/min) and 312℃(1℃/min) for 3 hours at each temperature. Successively, carbonization and graphitization were performed at 1,000℃ and 2,400℃, respectively, for one hour. Both the carbonized and graphitized fibers exhibited tensile strength of 570MPa. The structural parameters of carbon and graphite fibers were their orientation values of 56.2 and 58.1%, relatively low Lc(002) of 11.24 and 25Å, and large interlayer spacing (d002) of 3.86 and 3.49Å, respectively.
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