Broad-band conductivity and dielectric spectroscopy of composites of multiwalled carbon nanotubes and poly(ethylene terephthalate) around their low percolation threshold

2013 ◽  
Vol 24 (5) ◽  
pp. 055707 ◽  
Author(s):  
D Nuzhnyy ◽  
M Savinov ◽  
V Bovtun ◽  
M Kempa ◽  
J Petzelt ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Percolation Threshold ◽  
Multiwalled Carbon Nanotubes ◽  
Dielectric Spectroscopy ◽  
Ethylene Terephthalate ◽  
Broad Band ◽  
Multiwalled Carbon ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Band Conductivity

Antistatic Poly(Ethylene Terephthalate)/Polyaniline-Coating Multiwalled Carbon Nanotubes Nanocomposites

2012 ◽  
Vol 549 ◽  
pp. 553-557 ◽  
Author(s):  
Ruo Xi Wang ◽  
Hua Wang ◽  
Kang Zheng ◽  
Xing You Tian
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Multiwalled Carbon Nanotubes ◽  
Ethylene Terephthalate ◽  
In Situ Polymerization ◽  
Miniemulsion Polymerization ◽  
Multiwalled Carbon ◽  
Positive Effects ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

A convenient method had been developed for preparing antistatic Poly(ethylene terephthalate)/multiwalled carbon nanotubes (PET/MWCNTs) nanocomposites. Polyaniline (PANI) was employed to coat MWCNTs as interfacial modifier. At first, the PANI-coating MWCNTs (PANI-c-MWCNTs) were prepared via miniemulsion polymerization of aniline at the presence of MWCNTs. The TEM images, FT-IR spectra, UV-Vis spectra and electrical conductivity were investigated, which indicated that the MWCNTs were coated with a conductive PANI ultrathin film while the morphology and electrical property had almost no damage. Then the PANI-c-MWCNTs were added into PET through in-situ polymerization method. The TEM images indicate that PANI-c-MWCNTs could be well dispersed in PET matrix, which had important positive effects on the electrical conductive properties of PET/PANI-c-MWCNTs nanocomposites. The results indicate that the electrical conductivity of PET/1.0 wt% PANI-c-MWCNTs nanocomposites reaches the antistatic level.

Phase behaviour, microstructure, and percolation of poly(ethylene glycol) filled by multiwalled carbon nanotubes and organophilic montmorillonite

2011 ◽  
Vol 45 (24) ◽  
pp. 2555-2566 ◽  
Author(s):  
N.I. Lebovka ◽  
E.A. Lysenkov ◽  
A.I. Goncharuk ◽  
Yu.P. Gomza ◽  
V.V. Klepko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Ethylene Glycol ◽  
Percolation Threshold ◽  
Multiwalled Carbon Nanotubes ◽  
Phase Behaviour ◽  
Poly Ethylene Glycol ◽  
Multiwalled Carbon ◽  
Poly Ethylene ◽  
High Level

This work studies phase behavior, microstructure and percolation of the poly(ethylene glycol) (PEG), filled by multiwalled carbon nanotubes (MWCNTs), organo-modified montmorillonite (OMMT), and their mixtures, using differential scanning calorimentry (DSC), X-ray diffraction (XRD), electrical conductivity, and analysis of microscopic images. The DSC and XRD data showed a noticeable decrease of PEG crystallinity with increase of nanofiller content. Filling of PEG by MWCNTs was accompanied by a percolation threshold at ≈0.1 wt%, and the estimated electrical conductivity exponent ( t = 1.77 ± 0.07) was typical for the random percolation networks. The similar threshold behavior, but with higher percolation threshold ≈0.5–1.0 wt%, was observed for PEG filled by OMMT. The observed effect of OMMT-enhanced dispersion of MWCNTS in PEG at a high level of loading by nanoparticles offers good prospects for simultaneous improvement of the electrical and mechanical properties of PEG-based composites.

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