Chemically Enhanced Wet-Spinning Process to Accelerate Thermal Stabilization of Polyacrylonitrile Fibers

Fakhrhoseini, S, Khayyam, H and Naebe, M 2018, 'Chemically Enhanced Wet-Spinning Process to Accelerate Thermal Stabilization of Polyacrylonitrile Fibers', Macromolecular Materials and Engineering, vol. 303, no. 8, pp. 1-8.

Document type: Journal Article
Collection: Journal Articles

Title Chemically Enhanced Wet-Spinning Process to Accelerate Thermal Stabilization of Polyacrylonitrile Fibers
Author(s) Fakhrhoseini, S
Khayyam, H
Naebe, M
Year 2018
Journal name Macromolecular Materials and Engineering
Volume number 303
Issue number 8
Start page 1
End page 8
Total pages 8
Publisher Wiley - V C H Verlag GmbH and Co. KGaA
Abstract In this study, a fast and inexpensive approach is introduced to assist stabilization of polyacrylonitrile (PAN) fibers by adding ammonium iron(II) sulfate in coagulation bath. Effects of chemical treatment on stabilization process and structural evolution of fibers are studied using calorimetric, infrared, and X-ray techniques. A stepwise infrared study confirms the assisted cyclization reaction, and an X-ray analysis reveals a significant improvement in crystallinity and orientation of polymer chains which lead to an increase in tensile strength and modulus of PAN fibers. Differential scanning calorimetry results show 13 °C reductions in peak temperature of the stabilization reaction which means a sign of chemical activation at lower temperature by adding sulfate ions. Quantification of IR spectra shows a 7% increase in extent of reaction of chemically treated fibers and higher degree of conjugation compared with untreated and post-treated fibers. Finally, mechanical properties of chemically treated fibers are improved due to an increase in size and orientation of polymer chains after chemical treatment in the coagulation bath. Compared to control and post-treated PAN fibers, thermochemical properties of presented fibers are improved due to chemically assisted stabilization, and as a consequence, energy consumption of the stabilization step will be reduced by a simple and facile treatment.
Subject Automotive Engineering Materials
Process Control and Simulation
Mechanical Engineering not elsewhere classified
Numerical Modelling and Mechanical Characterisation
Keyword(s) carbon fibers
chemical treatment
energy consumption
DOI - identifier 10.1002/mame.201700557
Copyright notice © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN 1438-7492
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