Effect of Heat-Treatment on the Properties of PBO Fibers

Abstract:

PBO fiber is a kind of super fibers which has both high tension strength and high modulus. After the heat-treatment procedure, the PBO fiber would present more perfect mechanical properties. The process route of heat-treatment on as-spun fibers (PBO-AS fibers) was optimized, and the obtained high modulus fibers (PBO-HM fibers) were tested and characterized by SEM, XRD, XPS, FT-IR and Universal material machine. The higher the temperature is, the shorter the heat treatment time required for the same heat treatment. And the most preferred procedure in the air atmosphere of heat-treatment was 550°C with the resident time of 32 s and the pre-stress of 2.35 cN/dtex. After the heat-treatment, the modulus of PBO-HM grew up to 229.4 GPa (1487.78 cN/dtex). The tensile strength would not be greatly decreased, if the fiber could be kept in the nitrogen atmosphere. Besides, the XRD data and the XPS data proved that after the heat-treatment, the crystal size and the crystallinity would have a huge growth and the content of phosphorus element on the surface of PBO-HM fibers would fall sharply.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 2107-2117
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.2107
• Online since: June 2017
• Authors: Xiao Lin Zhu*, Wei Hua Zhong, Zi Ming Jin, Peng Zhang, Zhong Ren Guo, Ping Gong, Zhi Min Qu
• Keywords: Heat-Treatment of PBO Fiber, High Modulus, High Tension Strength

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