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Rheological properties of concentrated polyacrylonitrile co-polymer and lignin blend solution

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Abstract

Polyacrylonitrile copolymers with different molecular weights (Mws) are synthesised by aqueous free-radical redox polymerisation technique. Polyacrylonitrile (PAN) and lignin-blended solutions are prepared in dimethyl sulphoxide solvent by varying the polyacrylonitrile/lignin content. The effect of lignin addition to PAN copolymer having different weight-average Mws on the rheological properties is explored. Rheological measurements indicate that the solution viscosity reduces with the increase in the lignin content. The Cole–Cole plot or Han plot and Casson plot are used to characterise the solution homogeneity. The slope value of the plot suggests that the molecular-level homogeneity of the solution is not affected much by the addition of lignin. Thermal-induced gelation of concentrated solution has been rheologically investigated to avoid overheating of solution during the dissolution, storage and transportation for further wet spinning process.

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Acknowledgements

The authors acknowledge the financial support provided by Bharat Petroleum Corporation Limited, Greater Noida, India. The authors wish to acknowledge the team Center for Carbon Fiber and Prepreg, NAL, for their contribution during the research work.

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Authors and Affiliations

  1. Center for Carbon Fiber and Prepreg, CSIR - National Aerospace Laboratories, Bengaluru, 560017, India

    P. Porkodi, J. K. Abhilash & Hemant Kumar Shukla

  2. Bharat Petroleum Corporate R&D, Greater Noida, UP, 201306, India

    Jaya Rawat

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  1. P. Porkodi
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  2. J. K. Abhilash
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  3. Hemant Kumar Shukla
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Correspondence to P. Porkodi.

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Porkodi, P., Abhilash, J.K., Shukla, H.K. et al. Rheological properties of concentrated polyacrylonitrile co-polymer and lignin blend solution. Polym. Bull. 77, 3937–3951 (2020). https://doi.org/10.1007/s00289-019-02944-3

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  • DOI: https://doi.org/10.1007/s00289-019-02944-3

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