Microstructure and properties of polyacrylonitrile based carbon fibers |
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| Institution: | 1. National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. National Key Laboratory of Advanced Functional Composite Materials, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China;1. Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States;2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0295, United States;1. AGH – University of Science and Technology, Faculty of Materials Science and Ceramics, Cracow, Poland;2. Jagiellonian University, Faculty of Chemistry, Cracow, Poland |
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| Abstract: | The microstructure of polyacrylonitrile (PAN)-based carbon fibers with different mechanical properties was investigated. It was found that the tensile strength of the PAN-based carbon fibers generally decrease with the increase in the modulus. The properties of PAN-based carbon fiber are mainly controlled by the microstructure and microvoids. The increase in size and orientation of graphite crystallites follows the decrease in interlayer space of graphite sheets, which accompanies the increase in modulus and decrease in tensile strength of the carbon fibers. Simultaneously, the increase in the modulus of the carbon fibers accompanies the merging of the elliptical microvoids along the fiber axis and the turbostratic graphite in the carbon fibers transforms into 3D ordered graphite lamellar structure. This work provides useful information on tailoring the mechanical properties of carbon fibers by adjusting the microstructure. |
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| Keywords: | PAN Carbon fibers Microstructure Mechanical properties Microvoids |
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