Presentation Title

Carbon Nanotube Reinforced Carbon Fiber

Faculty Mentor

David Kisailus

Start Date

17-11-2018 2:30 PM

End Date

17-11-2018 2:45 PM

Location

C302

Session

Oral 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

Recent studies suggest that embedding single walled carbon nanotubes (SWNTs) in polyacrylonitrile (PAN) fibers can act as a template for graphitic domains to form, reducing the temperature required for graphitization, as well as enhance the strength of the resulting carbon fiber. Applying this method to an industrial scale will result in stronger and cheaper carbon fibers for use in fiber-reinforced composites. We investigate this theory by electrospinning PAN embedded with 0.05-0.2 wt% SWNT and annealing the resulting nanofibers so they graphitize. Results from Raman spectroscopy, Transmission Electron Microscopy and Differential Scanning Calorimetry, show that embedded SWNT’s do not decrease the graphitization temperature or increase the degree of graphitization. We expect tensile testing to show an increasing strength proportional to SWNT concentration that plateaus when the SWNT concentration becomes too high. The nanotubes could interfere with the ability of neighboring polymer chains to react with each other during graphitization, resulting in a more defective structure.

Summary of research results to be presented

The carbon fiber precursors used in this experiment were electrospun polyacrylonitrile (PAN) with 0, 0.05, 0.1 and 0.2 weight% SWNT’s. All fibers were oxidized at 275 °C in air and then annealed at 1000 °C in argon to induce graphitization. Raman was performed on as-spun fibers to confirm that the SWNT’s were well dispersed in the fiber mats, and TEM of annealed samples further showed good distribution of nanotubes. As-spun samples of each concentration underwent differential scanning calorimetry and thermogravimetric analysis to determine whether graphitization occurred at a lower temperature for samples embedded with SWNT’s. Raman was performed on annealed samples to observe whether there was a decrease in the D/G band ratio. All results showed that was no appreciable difference between SWNT concentrations.

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Nov 17th, 2:30 PM Nov 17th, 2:45 PM

Carbon Nanotube Reinforced Carbon Fiber

C302

Recent studies suggest that embedding single walled carbon nanotubes (SWNTs) in polyacrylonitrile (PAN) fibers can act as a template for graphitic domains to form, reducing the temperature required for graphitization, as well as enhance the strength of the resulting carbon fiber. Applying this method to an industrial scale will result in stronger and cheaper carbon fibers for use in fiber-reinforced composites. We investigate this theory by electrospinning PAN embedded with 0.05-0.2 wt% SWNT and annealing the resulting nanofibers so they graphitize. Results from Raman spectroscopy, Transmission Electron Microscopy and Differential Scanning Calorimetry, show that embedded SWNT’s do not decrease the graphitization temperature or increase the degree of graphitization. We expect tensile testing to show an increasing strength proportional to SWNT concentration that plateaus when the SWNT concentration becomes too high. The nanotubes could interfere with the ability of neighboring polymer chains to react with each other during graphitization, resulting in a more defective structure.