Electrical conductivity and oxygen permeability of polyacrylonitrile/multiwalled carbon nanotubes composites

Abstract

Polyacrylonitrile (PAN)/Multiwalled carbon nanotube (MWCNT) nanocomposites were prepared by nonconventional ultrasonic‐assisted emulsifier free emulsion polymerization technique with variable percentage of functionalized carbon nanotube. PAN/MWCNT nanocomposites were characterized by ultraviolet‐visible (UV‐visible) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The result from UV‐visible suggested that the functionalized MWCNT had interfacial interaction with PAN matrices. The surface morphology of functionalized MWCNT and PAN/MWCNT nanocomposites were studied by scanning electron microscopy (SEM). Electrical properties of PAN/MWCNT nanocomposites were measured and the result indicated that the conductivity increased with increasing concentration of MWCNTs. The oxygen permeability of PAN/MWCNT nanocomposites gradually increased with increase of MWCNT concentration, the result which was in agreement with the vertical alignment ofMWCNT in SEM. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers

A stochastic approach towards a predictive model on charge transport properties in carbon nanotube composites

“…This attempt-to-hop frequency, however, is a pre-factor that can be used to set the time scale. It was found that an attempt-to-hop frequency of ~10 4 s -1 leads to a time scale in reasonable agreement with experimental values in reference [92], so this value was used in this work for all simulations. The exponential in…”

“…(4) was chosen to be 0.6 Å -1 , which has been calculated for PAN [76]. Results from the simulations on box sizes of 800x100x100 (nm) 3 and 1000x100x100 (nm) 3 were fit to the power law and compared to experimental results on the conductivity of PAN/CNT composites ( Figure 12) taken from references [92,96]. These longer samples with NT aspect ratios of 1:400 were chosen for comparison because they were statistically indistinguishable from each other while also being the largest samples with maximum NT lengths, which are closer to the experimental reality, as previously discussed.…”

“…Effect of simulation box's size on conductivity for NTs with a 1:400 AR.Figure 12. Power law curves from simulation data fit to experimental data from works by Guo et al[96] and Pradhan et al[92] …”

Orientation and thermal properties of carbon nanotube/polyacrylonitrile nascent composite fibers

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Enhancement of thermal properties of polyacrylonitrile by reinforcement of Mg-Al layered double hydroxide

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