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Evolution of Carbon Fiber Microstructure During Carbonization and High-Temperature Graphitization Measured In Situ Using Synchrotron Wide-Angle X-ray Diffraction

Published online by Cambridge University Press:  22 June 2015

Michael Behr
Affiliation:
Core Research and Development, The Dow Chemical Company, Midland, MI 48667
James Rix
Affiliation:
DND-CAT Synchrotron Research Center, Northwestern University, APS/ANL 432-A004, 9700 S. Cass Avenue, Argonne, IL 60439
Brian Landes
Affiliation:
Core Research and Development, The Dow Chemical Company, Midland, MI 48667
Bryan Barton
Affiliation:
Core Research and Development, The Dow Chemical Company, Midland, MI 48667
Eric Hukkanen
Affiliation:
Core Research and Development, The Dow Chemical Company, Midland, MI 48667
Jasson Patton
Affiliation:
Core Research and Development, The Dow Chemical Company, Midland, MI 48667
Steven Weigand
Affiliation:
DND-CAT Synchrotron Research Center, Northwestern University, APS/ANL 432-A004, 9700 S. Cass Avenue, Argonne, IL 60439
Denis Keane
Affiliation:
DND-CAT Synchrotron Research Center, Northwestern University, APS/ANL 432-A004, 9700 S. Cass Avenue, Argonne, IL 60439
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Abstract

This paper will discuss the structure-property model developed that correlates the tensile modulus to the elastic properties and angular distribution of constituent graphitic layers for carbon fiber derived from a polyethylene precursor. In addition, a high-temperature fiber tensile device was built to enable heating of carbon fiber bundles at a variable rate from 25 °C to greater than ∼2300 °C, while simultaneously applying a tensile stress. This capability combined with synchrotron wide-angle x-ray diffraction (WAXD), enabled observation in situ and in real time of the microstructural transformation from different carbon fiber precursors to high-modulus carbon fiber. Experiments conducted using PAN- and PE-derived fiber precursors reveal stark differences in their carbonization and high-temperature graphitization behavior.

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