Polyolefin–carbon nanotube composites

Morcom, Melanie Fleur; Simon, George P.

doi:10.1533/9780857091390.2.511

Cited by 5 publications

(1 citation statement)

References 96 publications

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“…The thermal conductivity value can also be significantly influenced by the crystallinity of the polymer matrix, which is likely impacted by the addition of a surfactant and the inclusion of fillers, which has been widely attested to in the literature [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. The heterogeneous nucleation effects are not discussed in this paper.…”

Section: Resultsmentioning

confidence: 99%

Poly(Butylene Succinate) Hybrid Multi-Walled Carbon Nanotube/Iron Oxide Nanocomposites: Electromagnetic Shielding and Thermal Properties

et al. 2023

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To address the ever-increasing electromagnetic interference (EMI) pollution, a hybrid filler approach for novel composites was chosen, with a focus on EMI absorbance. Carbon nanofiller loading was limited to 0.6 vol.% in order to create a sustainable and affordable solution. Multiwall carbon nanotubes (MWCNT) and iron oxide (Fe3O4) nanoparticles were mixed in nine ratios from 0.1 to 0.6 vol.% and 8.0 to 12.0 vol.%, respectively. With the addition of surfactant, excellent particle dispersion was achieved (examined with SEM micrographs) in a bio-based and biodegradable poly(butylene succinate) (PBS) matrix. Hybrid design synergy was assessed for EMI shielding using dielectric spectroscopy in the microwave region and transmittance in the terahertz range. The shielding effectiveness (20–52 dB) was dominated by very high absorption at 30 GHz, while in the 0.1 to 1.0 THz range, transmittance was reduced by up to 6 orders of magnitude. Frequency-independent AC electrical conductivity (from 10−2 to 107 Hz) was reached upon adding 0.6 vol.% MWCNT and 10 vol.% Fe3O4, with a value of around 3.1 × 10−2 S/m. Electrical and thermal conductivity were mainly affected by the content of MWCNT filler. The thermal conductivity scaled with the filler content and reached the highest value of 0.309 W/(mK) at 25 °C with the loading of 0.6 vol.% MWCNT and 12 vol.% Fe3O4. The surface resistivity showed an incremental decrease with an increase in MWCNT loading and was almost unaffected by an increase in iron oxide loading. Thermal conductivity was almost independent of temperature in the measured range of 25 to 45 °C. The nanocomposites serve as biodegradable alternatives to commodity plastic-based materials and are promising in the field of electromagnetic applications, especially for EMI shielding.

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Section: Resultsmentioning

confidence: 99%

Poly(Butylene Succinate) Hybrid Multi-Walled Carbon Nanotube/Iron Oxide Nanocomposites: Electromagnetic Shielding and Thermal Properties

et al. 2023

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Morphological influence of carbon modifiers on the electromagnetic shielding of their linear low density polyethylene composites

Villacorta

Ogale

2014

J of Applied Polymer Sci

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The influence of morphology of carbon modifiers on the electrical, thermal, and mechanical properties of their polyethylene‐matrix composites is reported. Four heat‐treated (HT) carbon modifiers were investigated: PR‐19‐HT carbon nanofibers, multiwalled carbon nanotubes (MWNT‐HT), helical multiwalled carbon nanotubes (HCNT‐HT), and mesophase pitch‐based P‐55 carbon fibers as a control. These were melt‐mixed with linear low density polyethylene at 10 vol %, which was above the percolation threshold. The electromagnetic shielding effectiveness (EM SE) of the composites exhibits significant dependence on the modifier morphology. Thus, MWHTs, with the highest aspect ratio, lead to the highest composite electrical and thermal conductivities (34 Sm−1 and 1 Wm−1 K−1) and EM SE (∼24 dB). In contrast, HCNT, due to their coiled shape and low aspect ratio, lead to segregated microstructure and low EM SE (<1 dB). However, these composites display the highest ductility (∼250%) and flexibility, probably due to matrix‐modifier mechanical bonding provided by the helical morphology. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41055.

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Preparation and characterization of ultrahigh molecular weight polyethylene composites with high content of multiwall carbon nanotubes

Zhang

et al. 2020

Polymer Composites

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In order to obtain the ultrahigh molecular weight polyethylene (UHMWPE) composites with high conductivity and mechanical property, an effective route of solution mixing and followed by hot‐pressing was investigated for UHMWPE composites with high content of multiwall carbon nanotubes (MWCNTs). The effect of MWCNT contents on the crystallization and melting behavior, crystal structure, electrical conductivity, and mechanical properties of MWCNT/UHMWPE composites was characterized by differential scanning calorimetry, four‐probe measurement configuration, X‐ray diffraction, and universal testing machine, respectively. The effect of MWCNTs on crystallization temperatures of UHMWPE is discussed by the heterogeneous nucleation of MWCNTs and the restriction of the macromolecular chain motion of UHMWPE by MWCNTs. The electrical conductivity of UHMWPE is significantly increased with increasing of MWCNT contents and the UHMWPE composite with the conductivity of 5649 S m−1 can be obtained at the MWCNT content of 60 wt%. The influence of MWCNTs on tensile strength and modulus of UHMWPE composites is explained by the reinforce effect of MWCNTs and the lower content of UHMWPE not enough to support the structure of composites.

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Polyolefin–carbon nanotube composites

Cited by 5 publications

References 96 publications

Poly(Butylene Succinate) Hybrid Multi-Walled Carbon Nanotube/Iron Oxide Nanocomposites: Electromagnetic Shielding and Thermal Properties

Poly(Butylene Succinate) Hybrid Multi-Walled Carbon Nanotube/Iron Oxide Nanocomposites: Electromagnetic Shielding and Thermal Properties

Morphological influence of carbon modifiers on the electromagnetic shielding of their linear low density polyethylene composites

Preparation and characterization of ultrahigh molecular weight polyethylene composites with high content of multiwall carbon nanotubes

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