Melt processable polyacrylonitrile copolymer precursors for carbon fibers: Rheological, thermal, and mechanical properties

다국어 초록 (Multilingual Abstract)

Polyacrylonitrile (PAN) copolymers containing varying amounts of methyl acrylate (MA), P(AN-co-MA),were synthesized as a melt-spinnable precursor of carbonfibers. The rheological properties of P(AN-co-MA) with MA content of 15 mol% at 190 C proved to be suitable for melt-spinning and the PANfiber wasspun from an extruder. In order to prevent remelting and fusion of thefibers in the stabilization process,electron-beam irradiation of over 1500 kGy was used and the melt-spun PANfibers were successfullyconverted to stabilized PANfibers by thermal treatment up to 250 C. Finally, carbonfibers (CFs) wereproduced by pyrolysis of the stabilized PANfibers. The mechanical properties of the resulting-CFs wereevaluated; the tensile strength, tensile modulus, and elongation at break were 1.37

0.2 GPa,110

11.1 GPa, and 1.27

0.28%, respectively. These results suggest the possibility of utilizing meltspinningas a cost-efficient method for fabrication of carbonfibers.

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