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Rheological behavior during thermotropic gelation of polyacrylonitrile concentrated solutions

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Abstract

Dynamic viscoelastic properties of polyacrylonitrile(PAN)/DMSO/H2O solutions with different H2O contents were studied as a function of temperature. These PAN solutions gradually became gel with decreasing temperature. The sol-gel transition took place at a critical gel temperature, at which the scaling law of G′(ω)∼G″(ω)∝ω n held, allowing an accurate determination of the critical gel temperature by means of the frequency independence of the loss tangent. The gel point of PAN solutions increases with increasing H2O content. The scaling exponent n (=0.86) at the gel point is confirmed to be universal for PAN gels, which is independent of temperature, suggesting the similarity of the fractal structure in the critical PAN gels.

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Authors and Affiliations

  1. State Key Laboratory for Chemical Fibers Modification and Polymer Materials, Donghua University, Shanghai, 201620, China

    Cai-xia Ma  (马彩霞), Zong-yi Qin  (秦宗益) & Ding Pan  (潘 鼎)

  2. Research Centre for Analysis and Measurement, Donghua University, Shanghai, 201620, China

    Wei-xia Yan  (闫伟霞) & Li Zhang  (张 莉)

Authors
  1. Cai-xia Ma  (马彩霞)
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  2. Wei-xia Yan  (闫伟霞)
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  3. Li Zhang  (张 莉)
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  4. Zong-yi Qin  (秦宗益)
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  5. Ding Pan  (潘 鼎)
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Corresponding author

Correspondence to Ding Pan  (潘 鼎).

Additional information

Foundation item: Project(2006CB606505) supported by the National Basic Research Development Program of China; Project(50333050) supported by the National Natural Science Foundation of China; Project(07DJ14002) supported by the Shanghai Fundamental Theory Program; Project(20020255010) supported by the Specialized Research Fund for the Doctoral Program of Higher Education

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Ma, Cx., Yan, Wx., Zhang, L. et al. Rheological behavior during thermotropic gelation of polyacrylonitrile concentrated solutions. J. Cent. South Univ. Technol. 15 (Suppl 1), 122–125 (2008). https://doi.org/10.1007/s11771-008-0329-8

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  • DOI: https://doi.org/10.1007/s11771-008-0329-8

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