Open Access Received: 11 September 2025   |   Accepted: 13 October 2025   |   Published: 10 November 2025

CONCENTRATION DEPENDENT RHEOLOGICAL BEHAVIOR OF PAN COPOLYMER SOLUTIONS AND STRUCTURAL CHARACTERIZATION OF ELECTROSPUN FIBERS

Turayev J.I., Ashurov N.Sh., Abdurazokov M., Shakhabutdinov S.Sh., Atakhanov A.A.

Institute of polymer chemistry and physics, Tashkent, 100128 Uzbekistan

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Abstract. This study establishes a direct quantitative link between rheological parameters and nanofiber structure. As the concentration increased, a significant transition from viscous to elastic-dominant behavior was observed, indicating the formation of a more interconnected polymer network. Electrospinning was subsequently used to fabricate nanofibers from the polymer solutions. The nanofibers were characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD and scanning electron microscopy (SEM). FTIR spectra con-firmed the presence of characteristic PAN functional groups with minor shifts reflecting con-centration-related molecular interactions. XRD patterns revealed an increase in crystallinity with rising concentration. The main objective of this study is to determine the critical concentration regime for stable fiber formation and to correlate viscoelastic parameters with fiber structure.

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Key words. polyacrylonitrile (PAN), rheology, nanofibers.


DOI: http://uzpolymerjournal.com/articles/article.php?id=250305

*Corresponding author: Turayev J.I., Institute of polymer chemistry and physics, Tashkent, 100128 Uzbekistan

Citation: Turayev J.I., Ashurov N.Sh., Abdurazokov M., Shakhabutdinov S.Sh., Atakhanov A.A., CONCENTRATION DEPENDENT RHEOLOGICAL BEHAVIOR OF PAN COPOLYMER SOLUTIONS AND STRUCTURAL CHARACTERIZATION OF ELECTROSPUN FIBERS. Uzbekistan Journal of Polymers, Vol. 4(3) 2025: pp.54-62. DOI: http://uzpolymerjournal.com/articles/article.php?id=250305

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