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The cyclization index and toughness of gel spun polyacrylonitrile (PAN) proportionality with its heat of stabilization

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Abstract

The spun tapes of synthesized PAN, its copolymer with 1 wt% itaconic acid, and doped version with 1 wt% sodium dodecyl sulfate (SDS) all showed stripy, even, and compact cross-sections as the hallmark of gel forming products. PAN doping with SDS and acrylonitrile copolymerization with itaconic acid reduced its dimethylformamide (DMF) solution structural viscosity index (Δη) by 50% and 30%, respectively, at 675 s− 1. In addition, the modification of synthesized PAN through doping and acrylonitrile copolymerization with itaconic acid led to severe and mild gelation temperature decrease, respectively. The stabilization peak of the synthesized PAN tape was enhanced as much as 25 °C by 900% hot drawing, decreased by about 10 °C through copolymerization, while experienced small temperature changes through doping. The second derivative of Fourier transform infrared and Gaussian fitting was used to analyze the tapes cyclization due to stabilization treatment through introducing Isd index. 10 min Isd index was raised as much as 430% and 800% in comparison with the synthesized PAN through its doping or acrylonitrile copolymerization with itaconic acid, respectively. Further 180 min of Isd index, however, showed the same proportional increase as toughness of the drawn tapes versus their heat of stabilization through their physical and chemical modifications.

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Authors and Affiliations

  1. Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, PO Box 15875-4413, Tehran, Iran

    Mahmoud Heydari & Naser Mohammadi

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  1. Mahmoud Heydari
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  2. Naser Mohammadi
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Correspondence to Naser Mohammadi.

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Heydari, M., Mohammadi, N. The cyclization index and toughness of gel spun polyacrylonitrile (PAN) proportionality with its heat of stabilization. Iran Polym J 27, 395–404 (2018). https://doi.org/10.1007/s13726-018-0617-6

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  • DOI: https://doi.org/10.1007/s13726-018-0617-6

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