Preparation of conductive PTFE nanocomposite containing multiwalled carbon nanotube via latex heterocoagulation approach |
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Authors: | Eun Joo Park Sanghyun Hong Dong Wha Park Sang Eun Shim |
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Institution: | (1) Department of Chemical Engineering, Inha University, 253 Yonghyundong, Namgu, Incheon, 402-751, Republic of Korea; |
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Abstract: | Conductive poly(tetrafluoroethylene) (PTFE) composites containing surface-modified multiwalled carbon nanotubes (MWCNTs) were
prepared by a simple heterocoagulation process in water. Two different types of MWCNT were used and compared: carboxylated
MWCNT and cetyltrimethyl ammonium bromide (CTAB)-stabilized MWCNT. Aqueous PTFE dispersion was mixed with the well-dispersed
MWCNT dispersions and they were heterocoagulated with the aid of a flocculant, polyaluminum chloride at an elevated temperature.
After particle growth and successive stabilization step, particulated PTFE/MWCNT composites were prepared in the size range
of 10–100 μm. The MWCNT-containing PTFE composites have improved thermal stability and electrical conductivity. Importantly,
the percolation threshold for the electrical conductivity was achieved at a low concentration of MWCNT using this heterocoagulation
process. |
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Keywords: | |
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