Electrical properties of segregated ultrahigh molecular weight polyethylene/multiwalled carbon nanotube composites

Abstract

Multiwalled carbon nanotubes (MWNTs) and ultrahigh molecular weight polyethylene (UHMWPE) composites are prepared using paraffin as solvent. The resulting electrical properties show lower electrical percolation threshold, which is 1.4 vol %, than that of UHMWPE-MWNT composites prepared by gelation/crystallization from decalin solution. Good reproducibility and higher maximum of electrical conductivity are obtained. The extremely low electrical percolation threshold indicates that the dispersion of MWNTs is segregated, which can be proved by the morphology of the film observed by optical microscopy. The complex planes of electric modulus are useful to analyze the dispersion of MWNTs and the quality of interparticle contacts. In addition, the result of thermogravimetry shows that the retardation of onset of UHMWPE decomposition in inert gas is observed in the mixture with MWNTs.

Dielectric, FTIR spectroscopic and atomic force microscopic studies on polypyrrole‐poly(acrylonitrile‐co‐vinyl acetate) composites

“…Although the larger arc corresponds to lower electrical conductivity (i.e., 14 wt%), the composite with higher PPy content (i.e., 40 wt%) that exhibits a small arc in the complex plane diagram would give high electrical conductivity. Our results are consistent with previous studies [17, 34].…”

“…Although the larger arc corresponds to lower electrical conductivity (i.e., 14 wt%), the composite with higher PPy content (i.e., 40 wt%) that exhibits a small arc in the complex plane diagram would give high electrical conductivity. Our results are consistent with previous studies [17,34]. Figure 12 shows the frequency and temperature dependency in the dielectric constant for P(AN-co-VAc) film and PPy-P(AN-co-VAc) composite film including 40 wt% PPy.…”

Biocompatible Poly(L‐lactide)/MWCNT Nanocomposites: Morphological Characterization, Electrical Properties, and Stem Cell Interaction

“…This is a direct consequence of the interfacial relaxation between the PLLA matrix and MWCNTs. A step change in this behavior is observed clearly above the percolation threshold, where the dielectric constant is shifted to higher frequency when increasing MWCNT content in polymer matrix 41…”

Effect of processing conditions on the structure, electrical and mechanical properties of melt mixed high density polyethylene/multi-walled CNT composites in compression molding

“…It can be observed in Figure 7 that the nanocomposite containing 2 wt% MWCNTs under RC exhibits a slightly higher maximum current of 20.77 nA and more conductive regions uniformly distributed in the matrix compared to that under SC, indicating more conductive networks formed. This may be due to the lower crystallinity and smaller crystallites at RC facilitating the formation of conductive pathways [21] [40]. The information on the crystallinity and crystallite sizes of HDPE/MWCNT nanocomposites was presented via the XRD and DSC results in the previous section (Table 2).…”