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Hydrothermal aging mechanisms of aramid fibers via synchrotron small-angle X-ray scattering and dynamic thermal mechanical analysis

Authors

  • Chang-Sheng Li,

    1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, China
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  • Mao-Sheng Zhan,

    Corresponding author
    1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, China
    • Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, China
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  • Xian-Cong Huang,

    1. The Quartermaster Research Institute of the General Logistics Department of People's Liberation Army, Beijing, China
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  • Hong Zhou,

    1. The Quartermaster Research Institute of the General Logistics Department of People's Liberation Army, Beijing, China
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  • Yan Li

    1. The Quartermaster Research Institute of the General Logistics Department of People's Liberation Army, Beijing, China
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Abstract

In this study, synchrotron small-angle X-ray scattering (SAXS) and dynamic mechanical thermal analysis (DMTA) were used to evaluate the aging behavior of microfibrils and nanovoids. The effects of such structures on the tensile strength were also investigated. We investigated the correlation length of the fibril interface by fitting the SAXS intensity using the Debye–Bueche method. The orientation and size of the voids were determined with Ruland's streak method. The results show that the correlation length decreased with aging time at 90°C. Voids formed after aging at high temperatures for prolonged periods. In addition, the orientation of the 10 Å voids changed with the degree of degradation. DMTA results revealed a new transition temperature for the aged fibers. A model based on the SAXS and DMTA results is proposed to illustrate the hydrothermal aging mechanism. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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