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Thermal degradation and flame retardant mechanism of sulfonated polyoxadiazole fibers modified by metal ions

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Abstract

The sulfonated polyoxadiazole (SPOD) flame retardant fibers are prepared by wet spinning and modified by metal ions (Na+, Ca2+, Ba2+, and Mg2+). The structures of SPOD fibers are characterized by Fourier transform infrared spectrometry (FTIR), elements analysis (EA), inductively coupled plasma emission spectrometry (ICP), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Results show that sulfonate groups were successfully grafted on the POD fiber polymer, and metal ions are adsorbed in the fiber by physical and chemical adsorption. The micro-scale combustion calorimeter (MCC), limiting oxygen index (LOI), and UL-94 vertical burning tests are used to test the flame retardant properties of the fibers. Results show that the Mg-SPOD had the best flame retardant performance with LOI of 40% and the lowest heat release rate (HRR). The thermal degradation mechanism of the fiber is analyzed by thermogravimetric analysis coupled with infrared spectrometry (TG-FTIR), and the char residues were investigated by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The rapid and sharp emission of non-flammable SO2 and high content char residue covered with dense MgO and MgSO4 improve the flame retardant properties of Mg-SPOD fibers significantly.

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Acknowledgment

This work was supported by the National Key Research and Development Program of China (Project No. 2017YFB0309000), the Sichuan Science and Technology Planning Project (Project No. 2019ZDZX0016), and the Fundamental Research Funds for Central Universities. The authors gratefully acknowledge the State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, and the Analytical & Testing Centre of Sichuan University.

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Authors and Affiliations

  1. Jiangsu POD New Materials Co., Ltd, Zhangjiagang, 215638, China

    Wentao Li

  2. College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, China

    Shikai Qi, Qianli Liu, Huihui Gao, Shuheng Liang, Wenjie Feng & Mengjin Jiang

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  1. Wentao Li
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  2. Shikai Qi
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  3. Qianli Liu
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Correspondence to Mengjin Jiang.

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Li, W., Qi, S., Liu, Q. et al. Thermal degradation and flame retardant mechanism of sulfonated polyoxadiazole fibers modified by metal ions. J Polym Res 27, 365 (2020). https://doi.org/10.1007/s10965-020-02336-6

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