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Title Polyacrylonitrile/carbon nanotube composite fibers: reinforcement efficiency and carbonization studies
Publication Date
Date Accessioned
Degree PhD
Discipline/Department Polymer, Textile and Fiber Engineering
Degree Level doctoral
University/Publisher Georgia Tech
Abstract Polyacrylonitrile (PAN)/carbon nanotube (CNT) composite fibers were made using various processing methods such as conventional solution spinning, gel spinning, and bi-component gel spinning. The detailed characterization exhibited that the smaller and longer CNT will reinforce polymer matrix mostly in tensile strength and modulus, respectively. Gel spinning combined with CNT also showed the promising potential of PAN/CNT composite fiber as precursor fiber of the next generation carbon fiber. High resolution transmission electron microscopy showed the highly ordered PAN crystal layer on the CNT, which attributed to the enhanced physical properties. The subsequent carbonization study revealed that carbonized PAN/CNT fibers have at least 50% higher tensile strength and modulus as compared to those of carbonized PAN fibers. Electrical conductivity of CNT containing carbon fiber was also 50% higher than that of carbonized PAN fiber. In order to have carbon fiber with high tensile strength, the smaller diameter precursor fiber is preferable. Bi-component gel spinning produced 1-2 µm precursor fiber, resulting in ~1 µm carbon fiber. The tensile strength of the carbonized bi-component fiber (islands fibers) is as high as 6 GPa with tensile modulus of ~500 GPa. Further processing optimization may lead to the next generation carbon fiber.
Subjects/Keywords Polyacrylonitrile; Carbon nanotube; Bi-component spinning; Gel spinning; Carbon fiber; Polymeric composites; Nanotubes; Carbon fibers; Fibrous composites; Spinning
Contributors Satish Kumar (Committee Chair); Anselm Griffin (Committee Member); Dong Yao (Committee Member); Naresh Thadhani (Committee Member); Samuel Graham (Committee Member)
Country of Publication us
Record ID handle:1853/28125
Repository gatech
Date Indexed 2020-05-13
Issued Date 2008-03-31 00:00:00
Note [degree] Ph.D.; [advisor] Committee Chair: Satish Kumar; Committee Member: Anselm Griffin; Committee Member: Dong Yao; Committee Member: Naresh Thadhani; Committee Member: Samuel Graham;

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…46 Figure 3.2: Bright field TEM image of SWNT used in this study. 47 Figure 3.3: UV-vis-NIR spectra of SWNT/DMAc solution as a function of sonication time. 48 Figure 3.4: The schematics of solution preparation, gel spinning, and gel fiber drawing…

…temperature of PAN. The magnitude of reinforcement increases with increasing SWNT content. 123 Figure D.1: DSC thermograms of PAN and PAN/MWNT (5 wt%) fibers spun by conventional solution spinning. 124 Figure D.2: Isothermal DSC thermograms of gel

…small diameter PAN and PAN/CNT fibers using a combination of bicomponent spinning and gel spinning, and to study the stabilization and carbonization behavior of these small diameter fibers. Thesis introduction and brief review of literature is presented…

…improvement in low strain properties, and that long CNT length was important for high strain properties. xvii Gel spinning studies are presented in Chapter 3. Wide angle X-ray diffraction (WAXD) was used to study the structure of the gel spun…

…composite (99/1) fibers have been processed using core-shell and islands-in-a-sea bi-component cross-sectional geometry, and gel spinning. Shell and Sea component polymer are subsequently removed, and the core and islands component are stabilized…

…several millions g/mol. For producing fibers, various spinning methods can be used such as wet spinning, dry-jet-wet spinning, gel spinning, and melt spinning. It is also known that dry-jet-wet and gel spinning can produce highly drawn fibers with the low…

…x28;DMAc), N,Ndimethylformamide (DMF), or dimethylsulfoxide (DMSO) using conventional solution spinning, gel spinning, electrospinning, or by film casting. The results reveal that PAN 11 has strong interaction with CNTs…

…processing, and properties of gel spun PAN/CNT fibers. • To study the stabilization and carbonized behavior of gel spun PAN and PAN/CNT fibers. • To process small diameter PAN and PAN/CNT fibers using a combination of bicomponent spinning and gel spinning