Journal
CARBON
Volume 79, Issue -, Pages 274-293Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.07.068
Keywords
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Funding
- CAPES, Brazilian agency
- CNPq, Brazilian agency
- FINEP, Brazilian agency
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Although there are several reported correlations among structural parameters, Young's modulus (E), thermal conductivity, electrical resistivity and coefficient of thermal expansion of carbon fibers in the longitudinal direction, a single physical model has not yet been established to explain quantitatively these properties. Here a model of continuous defective graphene nanoribbons (dGNR), which are arranged in stacks, is presented to predict a number of properties of mesophase pitch (MPP)-based carbon fibers in a single physical framework. Reported in situ tensile tests and other works support the assumption that, for MPP-based carbon fibers with E > 350 GPa, slightly misaligned perfect graphene regions of the dGNR are longitudinally in series with defective regions of an approximately constant length (delta = 3 nm. The longitudinal properties of the dGNR depend strongly on the average longitudinal concentration of defective regions (x) of length delta, which can be estimated from the X-ray diffraction in-plane longitudinal coherence length (L-a parallel to). The model was applied with success to high- and ultra-high-modulus commercial MPP-based carbon fibers; other fibers were also discussed. The values for the properties of the defective regions were determined and are consistent with the proposed model structure; relative values and scaling factors between properties were discussed. (C) 2014 Elsevier Ltd. All rights reserved.
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