Journal
ACS OMEGA
Volume 5, Issue 34, Pages 21948-21960Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c03226
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Funding
- National Natural Science Foundation of China [U1960106, 51372177]
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials [WKDM201701]
- WUST National Defence Pre -research Foundation [GF201808]
- China Scholarship Council Fund [201808420114]
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Synthetic naphthalene pitches (SNPs) with isotropy and anisotropy were prepared by a simple thermal polycondensation method to fabricate pitch-based carbon fibers. The structural characteristic, thermal stability, phase-separation behavior, and melt-spinnability of the SNPs and the structural properties of the derived carbon fibers were systematically investigated. The results show that spinnable SNPs with controllable mesophase contents ranging from 0 to 100 vol % and softening points (210-290 degrees C) could be easily obtained by a nitrogen-bubbling treatment to improve their thermal stability and meltspinnability by avoiding the phase separation of liquid crystal (LC) in the pitch. An experimental phase diagram of spinnability and mesophase content is newly proposed for predicting the spinnability of a mesophase-containing pitch. The LC has a significant influence not only on the constituents, structure, and physical properties of the SNPs but also on the final structure and properties of the corresponding pitch-based carbon fibers. The low ash content (less than 0.15 wt %) in the pitch precursor is found to have no obvious effect on the pitch spinnability and the mechanical properties of derivative large-diameter carbon fibers.
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