Melt-spinnable polyacrylonitrile copolymer precursors for carbon fibers

POLYMER

卷:126

Article

Miller, G. C.^1,3  Yu, J.^2,3  Joseph, R. M.^1,3  Choudhury, S. R.^1,3  Mecham, S. J.^1,3  Baird, D. G.^2,3  Bortner, M.^2,3  Norris, R. E.⁴  Paulauskas, F. L.⁴  Riffle, J. S.^1,3 

[1] Virginia Polytech Inst & State Univ, Dept Chem, Blacksburg, VA 24061 USA

[2] Virginia Polytech Inst & State Univ, Dept Chem Engn, Blacksburg, VA 24061 USA

[3] Virginia Polytech Inst & State Univ, Macromol Innovat Inst, Blacksburg, VA 24061 USA

[4] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA

关键词: Polyacrylonitrile;    Carbon fiber;    PAN precursor;   

DOI  :  10.1016/j.polymer.2017.08.023

来源: Elsevier

【 摘 要 】

This paper describes the feasibility of achieving melt-processable polyacrylonitrile copolymer precursors for producing high strength carbon fibers. High molecular weight poly(acrylonitrile-ran-methyl acrylate) (PAN-MA) copolymers with high acrylonitrile content were mixed were various binary melting point modifiers with one component being water to produce systems that formed stable melts at temperatures below the temperature corresponding to the onset of PAN-MA crosslinking. The structure of the copolymer was 96.5 +/- 0.13 mol% AN and 4.40 +/- 0.13 mol % MA by H-1 NMR with an M-w = 238 kDa and polydispersity of 1.9 determined by size exclusion chromatography. A reduction in the T-m of the copolymer of 200 degrees C was established for one of the copolymer/melting point modifier systems, which corresponds to the greatest reduction in a PAN-based copolymer melting temperature yet reported. From isothermal DSC and pressurized capillary rheometry experiments it was found that the stability of the resulting melts shows a strong temperature dependence, but does not show a strong dependence on shear-rate. Copolymer mixtures consisting of H2O and acetonitrile or adiponitrile were found to be suitable for melt-extrusion at 170 degrees C with viscosities ranging from 1800 to 2000 Pa*s and stabilities of the melts >= 1 h. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

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