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Corrosion degradation behavior of PBO fibers under strong inorganic acid

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Abstract

Known as the super fiber of the twenty-first century, poly-p-phenylenebenzobisoxazole (PBO) fibers exhibit outstanding strength and modulus, fire and heat resistance, which are superior to those of poly-p-phenylene terephthalamide fiber. However, the poor resistance of acid corrosion is regarded as a fatal weakness, which restricts its application in complicated chemical environment. In present work, PBO fibers were exposed in strong acid solutions under different conditions, and then, surface morphology was observed by optical microscopy and scanning electron microscopy. Substantial changes in functional groups were investigated by Fourier-transform infrared (FTIR) spectroscopy, as well as changes in crystalline structure using differential scanning calorimetry (DSC) and thermal stability using thermogravimetric analysis (TGA). After treatment by H2SO4 and HNO3 solution, the strength of the fibers declines typically, while the modulus increases. It is attributed to the formation of N–H bonds in the vicinity of 3410.0 cm−1 confirmed by FTIR spectra. Hydrogen bonds, derived from N–H bonds, increase the thermal degradation temperature from 716.4 °C (untreated) to 725.6 °C (treated by H2SO4), shown in TGA curves. HNO3 treatment is more destructive than that of H2SO4. There exist longitudinal corrosion cracks after treatment by HNO3 solution. Furthermore, HNO3 solution penetrates into crystalline region and destroys the ordered crystal structure of PBO fibers demonstrated by DSC results.

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Acknowledgements

The authors gratefully acknowledge the financial support of Zibo City-Shandong University of Technology Cooperative Projects (2018ZBXC474, Key Research and Development Program of Shandong Province (Soft Science) (2019RKB01208), Innovation Guidance Fund of Yellow River Delta Research Institute (2018-7), the Open Project Program of Fujian Key Laboratory of Novel Functional Textile Fibers and Material, Minjiang University, China (N0.FKLTFM1820), Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province (1804), the Open Project Program of Fujian Key Laboratory of Novel Functional Textile Fibers and Materials (Minjiang University), China (No. FKLTFM1820), Science and Technology Guidance Project of China National Textile and Apparel Council (2018005), Open Fund of Provincial Key Laboratory of Eco-Industrial Green Technology, Wuyi University (WYKF2019-5), Key Topics of Art Science in Shandong Province(ZH201906014), Fujian Provincial Key Laboratory of Textiles Inspection Technology (Fujian Fiber Inspection Bureau) (2018-MXJ-02), Zhejiang Provincial Top Key Academic Discipline of Chemical Engineering and Technology, Zhejiang Sci-Tech University (YR2017006) and Shandong Province Higher Educational Science and Technology Program (J17KB011).

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Authors and Affiliations

  1. Lutai School of Textile and Apparel, Shandong University of Technology, Zibo, 255000, China

    Zhaohui Jiang, Mingyue Tian, Zengge Guo, Qicai Wang, Zhao Jia & Zuowei Ding

  2. Provincial Key Laboratory of Eco-Industrial Green Technology, Wuyi University, Wuyishan City, 354300, China

    Zhaohui Jiang

  3. Fujian Provincial Key Laboratory of Textiles Inspection Technology, Fujian Fiber Inspection Bureau, Fuzhou, 350026, China

    Zhaohui Jiang

  4. Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing University, Shaoxing, 312000, China

    Zhaohui Jiang

  5. State Key Laboratory of Biobased Fiber Manufacture Technology, China Textile Academy, Beijing, 100025, China

    Jian Jin

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  1. Zhaohui Jiang
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  2. Mingyue Tian
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  3. Zengge Guo
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  7. Jian Jin
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Correspondence to Zhaohui Jiang.

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Jiang, Z., Tian, M., Guo, Z. et al. Corrosion degradation behavior of PBO fibers under strong inorganic acid. Polym. Bull. 78, 4947–4958 (2021). https://doi.org/10.1007/s00289-020-03348-4

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  • DOI: https://doi.org/10.1007/s00289-020-03348-4

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