Viscometric measurement of the thermodynamics of PAN terpolymer/DMSO/water system and effect of fiber-forming conditions on the morphology of PAN precursor

Authors

  • Ruijiao Dong,

    1. State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China
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  • Marcus Keuser,

    1. School of Applied Chemistry, Reutlingen University, Reutlingen D-72762, Germany
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  • Xiaomei Zeng,

    1. State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China
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  • Jiongxin Zhao,

    Corresponding author
    1. State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China
    • State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China
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  • Youwei Zhang,

    1. State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China
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  • Chengxun Wu,

    1. State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China
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  • Ding Pan

    1. State Key Laboratory for Modification of Chemical Fiber and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China
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Abstract

The thermodynamics of polyacrylonitrile (PAN) terpolymer/dimethyl sulphoxide (DMSO)/water system was investigated by viscometric method. Fourier transform infrared (FTIR) measurement of the temperature dependence of polymer/solvent interaction was performed in the range of 25–80 °C, which was in good agreement with viscometric results. Meanwhile, the upper critical solution temperature (UCST) for PAN terpolymer/DMSO/water system, which is proved to be stable one, was determined from the temperature dependence of the expansion factor αη3. The morphology of PAN precursor prepared by dry-jet-wet spinning with different fiber-forming conditions was examined with a scanning electron microscope (SEM). Judging from SEM photographs, not only the number and size of microvoids of PAN precursor gradually increase, with increasing the temperature of coagulation bath, but also the cross-section shape of PAN precursor changes from nephroid shape to elliptical shape or circular shape. Therefore, PAN precursor with different microstructures can be fabricated at different quenching-depths, suggesting that the final microstructure of the PAN precursor greatly depends on the phase separation in the fiber-forming process. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 1997–2011, 2008

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