Improving the electrical conductivity of ethylene 1‐octene copolymer/cyclic olefin copolymer immiscible blends by interfacial localization of MWCNTs

Abstract

The localization of multiwall carbon nanotubes (MWCNTs) in the immiscible blends of ethylene-1-octene copolymer (EOC) and cyclic olefin copolymer (COC) with the seaisland morphology and electrical conductivity of resulting nanocomposites were investigated. Depending on the feeding orders, as the MWCNTs were located in the COC droplet, the electrical conductivity was obtained as high as 5.71 × 10 −7 S/cm, while the MWCNTs were located in EOC/COC interface, the electrical conductivity increased significantly up to 1.72 × 10 −2 S/cm. The improved electrical conductivity in EOE/COC/MWCNTs nanocomposite is attributed to the interfacial localization of MWCNTs which is resulted from thermodynamic affinity of MWCNTs to COC, as well as an interconnected structure via deformed and swelled COC droplets. Thermodynamic affinity of MWCNTs to COC and established interconnected structure are confirmed by rheological characterization, microscopic observations, dynamic mechanical analysis, and electrical conductivity measurements. Therefore, as a result of selective localization of MWCNTs and well-designed phase morphology, lower rheological and especially electrical percolation thresholds could be obtained in the ternary nanocomposites compared to the binary systems. POLYM. ENG. SCI., 59:447-456, 2019.

New electromagnetic shielding materials based on viscose‐carbon nanotubes composites

“…Viscose fibers -CNT composites combine the advantages of the high conductivity performance of CNT with relatively low-cost and easily processed organic polymers. The composites of cellulose and multiwalled CNT have a good electrical conductivity, as has been recently reported [22]. These composites are useful in fabrication devices acting as protective tools at electromagnetic interferences.…”

Localization of Poly(glycidyl methacrylate) Grafted on Reduced Graphene Oxide in Poly(lactic acid)/Poly(trimethylene terephthalate) Blends for Composites with Enhanced Electrical and Thermal Conductivities

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Fabrication of electrically conductive microparts by constructing carbon black-rich network under high shear conditions in microinjection molding

“…Various strategies (Naficy and Garmabi, 2007;Deng et al, 2014;Zhou et al, 2017a;Salehiyan and Ray, 2018;Zhao et al, 2021) such as the use of high efficiency conductive fillers and controlling the morphology of the composites are adopted to reduce the percolation threshold of conductive polymer composites (CPCs). Regulating the morphology of immiscible blends (i.e., materials with at least two phases) and the selective localization of fillers in one particular phase or at the interface of two phases are critical for preparing CPCs with high σ (Shen et al, 2017;Zhang et al, 2019a;Zhang et al, 2019b;Hosseinpour et al, 2019). The distribution of fillers in the immiscible blend is affected by both thermodynamic and kinetic factors (Baudouin et al, 2010;Taguet et al, 2014;Hoseini et al, 2017b).…”