Stabilization and Carbonization of Gel Spun Polyacrylonitrile/Single Wall Carbon Nanotube Composite Fibers
Final rept., 1 Feb-30 Nov 2006
GEORGIA INST OF TECH ATLANTA
Pagination or Media Count:
Gel spun polyacrylonitrile PAN and PANsingle wall carbon nanotube SWNT composite fibers have been stabilized in air and subsequently carbonized in argon at 1100 degrees C. Differential scanning calorimetry DSC and infrared spectroscopy suggests that the presence of single wall carbon nanotube affects PAN stabilization. Carbonized PANSWNT fibers exhibited 10 to 30 nm diameter fibrils embedded in brittle carbon matrix, while the control PAN carbonized under the same conditions exhibited brittle fracture with no fibrils. High resolution transmission electron microscopy and Raman spectroscopy suggests the existence of well-developed graphitic regions in carbonized PANSWNT and mostly disordered carbon in carbonized PAN. Tensile modulus and strength of the carbonized fibers were as high as 250 Ntex and 1.8 Ntex for the composite fibers and 168 Ntex and 1.1 Ntex for the control PAN based carbon fibers, respectively. The addition of 1 wt carbon nanotubes enhanced the carbon fiber modulus by 49 and strenath bv 64.
- Refractory Fibers
- Atomic and Molecular Physics and Spectroscopy