Single wall carbon nanotube templated oriented crystallization of poly(vinyl alcohol)
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- Single wall carbon nanotube templated oriented crystallization of poly(vinyl alcohol)
- Minus, Marilyn L.; Chae, Han Gi; Kumar, Satish
- Carbon nanotubes; Orientation; Poly(vinyl alcohol)
- Issue Date
- ELSEVIER SCI LTD
- POLYMER, v.47, no.11, pp.3705 - 3710
- Shearing of poly(vinyl alcohol) (PVA)/single wall carbon nanotube (SWNT) dispersions result in the formation of self-assembled oriented PVA/SWNT fibers or ribbons, while PVA solution results in the formation of unoriented fibers. Diameter/width and length of these self-assembled fibers was 5-45 μm and 0.5-3 mm, respectively. High-resolution transmission electron micrographs showed well resolved PVA (200) lattice with molecules oriented parallel to the nanotube axis. Nanotube orientation in the self-assembled fibers was also determined from Raman spectroscopy. PVA fibers exhibited about 48% crystallinity, while crystallinity in PVA/SWNT fibers was 84% as determined by wide angle X-ray diffraction. PVA and carbon nanotubes were at an angle of 25-40° to the self-assembled fiber axis. In comparison to PVA, PVA/SWNT samples exhibited significantly enhanced electron beam radiation resistance. This study shows that single wall carbon nanotubes not only nucleate polymer crystallization, but also act as a template for polymer orientation. ⓒ 2006 Elsevier Ltd. All rights reserved.
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