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Polyvinyl Alcohol Reinforced Flame-Retardant Polyacrylonitrile Composite Fiber Prepared by Boric Acid Cross-Linking and Phosphorylation

1
School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China
2
Key Laboratory of Advanced Textile Composite, Ministry of Education, Tianjin Polytechnic University, Tianjin 300387, China
3
School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(12), 2391; https://doi.org/10.3390/ma11122391
Received: 26 October 2018 / Revised: 20 November 2018 / Accepted: 26 November 2018 / Published: 27 November 2018
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Abstract

To improve the strength and maintain the inherent properties of flame-retardant polyacrylonitrile (FR-PAN) fiber, a commercialized hydrocarbon polymer, i.e., poly (vinyl alcohol) (PVA), used as an enhancement component, was blended with polyacrylonitrile (PAN) spinning dope to fabricate a PVA/PAN composite fiber through wet-spun technology. Then, cross-linked PVA/PAN composite fiber (C-PVA/PAN) was acquired via boric acid cross-linking. Finally, flame-retardant C-PVA/PAN fiber (FR-PVA/PAN) was prepared by phosphorylation. The structures of the samples were characterized by Fourier transform infrared analysis (FTIR) and X-ray photoelectron spectroscopy (XPS). The thermogravimetric analysis (TGA) results reveal that the thermal stability of the composite fiber is lower than that of the pristine PAN fiber. However, the char residue of the composite fiber is higher than that of the control sample, wherein, FR-PVA/PAN has the highest char residue of 62.5 wt% at 800 °C. The results regarding the combustion properties of FR-PVA/PAN show that the fire hazard of FR-PVA/PAN is restrained greatly, indicating excellent flame-retardant performance. The corresponding flame-retardant mechanism of FR-PAV/PAN is investigated by Pyrolysis gas chromatography and mass spectrometry (Py-GC/MS) and thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR). The results indicate the gas-phase and condensed-phase flame-retardant mechanisms. View Full-Text
Keywords: polyacrylonitrile; poly (vinyl alcohol); flame retardance; high strength; composite fiber; phosphorylation polyacrylonitrile; poly (vinyl alcohol); flame retardance; high strength; composite fiber; phosphorylation
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Ren, Y.; Tian, T.; Jiang, L.; Liu, X.; Han, Z. Polyvinyl Alcohol Reinforced Flame-Retardant Polyacrylonitrile Composite Fiber Prepared by Boric Acid Cross-Linking and Phosphorylation. Materials 2018, 11, 2391.

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