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Rheological study on thermal-induced gelation behavior of polyacrylonitrile solution

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Abstract

Thermal-induced gelation process of different polyacrylonitrile (PAN) solutions was investigated through dynamic rheological measurements. The rheological material parameters characterizing the gelation behavior of the PAN solutions were measured and the effects of such factors as water content, solvent type and concentration on the gelation process were analyzed. It is found that the gel point T gel of PAN/DMSO (dimethyl sulfoxide)–water solution increases with increased water content in the solution. Also, T gel becomes higher when the solvent has a lower solvency for PAN. A linear relationship between logG′ and logω, logG″ and logω indicates the beginning of gelation. The PAN concentration of the solution affects T gel in a way similar to that of the water content. The relaxation exponent n is found to relate to the fractal dimension of the polymer gel. For PAN/DMSO–water solution, this exponent n remains almost constant when the water content differs. The solvent type and concentration respectively influences n value in their own way. The PAN/DMSO–water solution systems in our work exhibit similar characteristics of gel structure, concluded from the n and d f values of these systems. A logarithmic plot between G′ and G″ can be used to evaluate the structural evolution of the solution, and a comparatively steep slope of the curve is an indication of gelation.

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Acknowledgements

This work was supported by grants from the National Basic Research Program (973 Program) (2006CB606505), the Shanghai Fundamental Theory Program (07DJ14002) and the Shanghai Leading Academic Discipline Project (B603).

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Authors and Affiliations

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

    Lianjiang Tan & Ding Pan

  2. Biological and Agricultural Engineering Department, University of California, Oakland, CA, 6561, USA

    Ning Pan

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  1. Lianjiang Tan
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  2. Ding Pan
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  3. Ning Pan
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Correspondence to Ding Pan.

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Tan, L., Pan, D. & Pan, N. Rheological study on thermal-induced gelation behavior of polyacrylonitrile solution. J Polym Res 16, 341–350 (2009). https://doi.org/10.1007/s10965-008-9234-y

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