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Tailoring structures and properties of mesophase pitch-based carbon fibers based on isotropic/mesophase incompatible blends

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Abstract

Blends composed of isotropic and mesophase pitches in various proportions were used as precursors for carbon fibers. The effects of composition on the morphology of blends, precursor spinnability, transversal texture, and mechanical properties of the final carbon fiber were studied. The blends are binary incompatible phase-separation systems. When the content of isotropic pitch is ≤30 %, it is distributed uniformly in the mesophase matrix as spheres; whereas, complete phase inversion occurs when the content is ≥35 %. Blends containing isotropic pitch in dispersion phase show good spinnability and small-diameter fibers can be continuously drawn. The transversal texture of carbon fibers is transformed from a radial type with a crack along the fiber axis to an intermediate morphology between radial and random type by blending 20–30 % isotropic pitch. The tensile strength of carbon fibers with 20–30 % IPc is 2.5 times as high as the AR-based CF without the reduction of Young’s modulus.

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Abbreviations

MPCF:

Mesophase pitch-based carbon fibers

AR:

Aromatic Resin

IPc:

Coal tar-derived isotropic pitch

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Acknowledgements

The financial supports of the National Natural Science Foundation of China (No. 51002127 and 51072169) and Natural Science Foundation of Fujian Province of China (No. 2009J05134) are greatly appreciated.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China

    Yanbo Yao, Jianming Chen & Ling Liu

  2. Advanced Materials Laboratory, Key Laboratory of High Performance Ceramic Fibers of Ministry of Education, College of Materials, Xiamen University, Xiamen, 361005, China

    Yanbo Yao, Jianming Chen, Ling Liu, Yanming Dong & Anhua Liu

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  1. Yanbo Yao
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  2. Jianming Chen
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  3. Ling Liu
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Correspondence to Anhua Liu.

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Yao, Y., Chen, J., Liu, L. et al. Tailoring structures and properties of mesophase pitch-based carbon fibers based on isotropic/mesophase incompatible blends. J Mater Sci 47, 5509–5516 (2012). https://doi.org/10.1007/s10853-012-6442-y

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