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Melt-Spun Fibers for Textile Applications
Article

Melt-Spinning of an Intrinsically Flame-Retardant Polyacrylonitrile Copolymer

1
German Institutes of Textile and Fiber Research, Körschtalstr. 26, D-73770 Denkendorf, Germany
2
Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
3
Dralon GmbH, Chempark Dormagen, Postfach 10 04 85, 41522 Dormagen, Germany
*
Author to whom correspondence should be addressed.
Materials 2020, 13(21), 4826; https://doi.org/10.3390/ma13214826
Received: 12 October 2020 / Revised: 25 October 2020 / Accepted: 26 October 2020 / Published: 28 October 2020
(This article belongs to the Special Issue Novel Synthetic Fibers for Textile Applications)
Poly(acrylonitrile) (PAN) fibers have two essential drawbacks: they are usually processed by solution-spinning, which is inferior to melt spinning in terms of productivity and costs, and they are flammable in air. Here, we report on the synthesis and melt-spinning of an intrinsically flame-retardant PAN-copolymer with phosphorus-containing dimethylphosphonomethyl acrylate (DPA) as primary comonomer. Furthermore, the copolymerization parameters of the aqueous suspension polymerization of acrylonitrile (AN) and DPA were determined applying both the Fineman and Ross and Kelen and Tüdõs methods. For flame retardancy and melt-spinning tests, multiple PAN copolymers with different amounts of DPA and, in some cases, methyl acrylate (MA) have been synthesized. One of the synthesized PAN-copolymers has been melt-spun with propylene carbonate (PC) as plasticizer; the resulting PAN-fibers had a tenacity of 195 ± 40 MPa and a Young’s modulus of 5.2 ± 0.7 GPa. The flame-retardant properties have been determined by Limiting Oxygen Index (LOI) flame tests. The LOI value of the melt-spinnable PAN was 25.1; it therefore meets the flame retardancy criteria for many applications. In short, the reported method shows that the disadvantage of high comonomer content necessary for flame retardation can be turned into an advantage by enabling melt spinning. View Full-Text
Keywords: flame retardation; polyacrylonitrile; PAN; melt spinning flame retardation; polyacrylonitrile; PAN; melt spinning
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MDPI and ACS Style

König, S.; Kreis, P.; Herbert, C.; Wego, A.; Steinmann, M.; Wang, D.; Frank, E.; Buchmeiser, M.R. Melt-Spinning of an Intrinsically Flame-Retardant Polyacrylonitrile Copolymer. Materials 2020, 13, 4826. https://doi.org/10.3390/ma13214826

AMA Style

König S, Kreis P, Herbert C, Wego A, Steinmann M, Wang D, Frank E, Buchmeiser MR. Melt-Spinning of an Intrinsically Flame-Retardant Polyacrylonitrile Copolymer. Materials. 2020; 13(21):4826. https://doi.org/10.3390/ma13214826

Chicago/Turabian Style

König, Simon, Philipp Kreis, Christian Herbert, Andreas Wego, Mark Steinmann, Dongren Wang, Erik Frank, and Michael R. Buchmeiser 2020. "Melt-Spinning of an Intrinsically Flame-Retardant Polyacrylonitrile Copolymer" Materials 13, no. 21: 4826. https://doi.org/10.3390/ma13214826

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