Details

Autor(en) / Beteiligte

• Chatterjee, T.
• Yurekli, K.
• Hadjiev, V. G.
• Krishnamoorti, R.

Titel

Single-Walled Carbon Nanotube Dispersions in Poly(ethylene oxide)

Ist Teil von

• Advanced functional materials, 2005-11, Vol.15 (11), p.1832-1838

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2005

Quelle

Wiley Online Library All Journals

Beschreibungen/Notizen

• Dispersions of single‐walled carbon nanotubes (SWNTs) in poly(ethylene oxide) (PEO) assisted by a lithium‐based anionic surfactant demonstrate an electrical percolation of 0.03 wt.‐% and a geometrical percolation, inferred from melt rheometry, of 0.09 wt.‐%. Both the melting temperature and the extent of crystallinity of the PEO crystals decrease with increasing SWNT loading. Raman spectroscopy of the nanocomposites indicates a down‐shift of the SWNT G‐modes and suggests that the nanotubes are subjected to tensile stress transfer from the polymer at room temperature. Excellent dispersion of single‐walled CNTs in poly(ethylene oxide)—manifested in the sigmoidal dependence of the reduced viscosity (ηr*) and its dramatic increase with increasing CNT content (see Figure)—using a lithium‐based anionic surfactant is reported. Fitting to a percolation model implies a percolation threshold of 0.09 wt.‐% and an effective CNT aspect ratio of ≥650.