Dielectric relaxation and ac conduction in γ-irradiated UHMWPE/MWCNTs nano composites: Impedance spectroscopy analysis

Maqbool, Syed Asad; Mehmood, Malik Sajjad; Mukhtar, Saqlain Saqib; Baluch, M. A. A.; Yasin, Tariq; Khan, Yaqoob

doi:10.1016/j.radphyschem.2017.01.020

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…From Figure (c), the MWCNT seems to locate selectively in the PBT phase, and the localized MWCNT may affect the electrical properties forming local conductive paths. Conductive fillers tend to locate in a single polymer phase that has a lower interfacial tension in the polymer with conductive filler composite, which is called a selective localization that may be expected to induce the conductive network within the polymer phase to increase electrical properties …”

Section: Resultsmentioning

confidence: 99%

Effects of hybrid fillers on the electrical conductivity, EMI shielding effectiveness, and flame retardancy of PBT and PolyASA composites with carbon fiber and MWCNT

Kim

Kwon

Kim

2019

J of Applied Polymer Sci

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The effects of hybrid fillers of carbon fiber (CF) and multiwall carbon nanotube (MWCNT) on the electrical conductivity, electromagnetic interference shielding effectiveness (EMI SE), flame retardancy, and mechanical properties of poly(butylene terephthalate) (PBT)/poly(acrylonitrile‐co‐styrene‐co‐acrylate) (PolyASA) (70/30, wt %) with conductive filler composites were investigated. The CF was used as the main filler, and MWCNT was used as the secondary filler to investigate the hybrid filler effect. For the PBT/PolyASA/CF (8 vol %)/MWCNT (2 vol %) composite, a higher electrical conductivity (1.4 × 100 S cm−1) and EMI SE (33.7 dB) were observed than that of the composite prepared with the single filler of CF (10 vol %), which were 9.0 × 10−2 S cm−1 and 23.7 dB, respectively. This increase in the electrical properties might be due to the longer CF length and hybrid filler effect in the composites. From the results of aging test at 85 °C, 120 h, the electrical conductivity and EMI SE of the composites decreased slightly compared to that of the composite without aging. The results of electrical conductivity, EMI SE, and flame retardancy suggested that the composite with the hybrid fillers of CF and MWCNT showed a synergetic effect in the PBT/PolyASA/CF (8 vol %)/MWCNT (2 vol %) composite. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48162.

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Section: Resultsmentioning

confidence: 99%

Effects of hybrid fillers on the electrical conductivity, EMI shielding effectiveness, and flame retardancy of PBT and PolyASA composites with carbon fiber and MWCNT

Kim

Kwon

Kim

2019

J of Applied Polymer Sci

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“…Carbon composites of ultra‐high molecular weight polyethylene (UHMWPE) have potential applications in areas such as biomedical sensors, electromagnetic interference shielding, and in particular to this study, orthopedic bearings 1–9 . Clinical deployment of carbon‐UHMWPE composites in the 1970s and 1980s (Poly II carbon fiber‐reinforced knee bearings) for the purpose of decreasing wear rates was unsuccessful in part due to poor manufacturing process control and a lack of understanding of polymer oxidation pathways.…”

Section: Introductionmentioning

confidence: 99%

“…To date, few authors have explored both mechanical and electrical properties of conductive‐filled systems with regards to UHMWPE, many only studying one aspect of the systems 2,8,9,12–18 . Graphene is of interest as a strengthening material because of its high mechanical properties including an in‐plane elastic modulus of 0.5–1 TPa and tensile strength of 130 GPa, however little research exists into graphene/UHMWPE composites 7,17,19 .…”

Section: Introductionmentioning

confidence: 99%

Shear enhancement of mechanical and microstructural properties of synthetic graphite and ultra‐high molecular weight polyethylene carbon composites

Favreau

Miroshnichenko

Solberg

et al. 2022

J of Applied Polymer Sci

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Ultra‐high molecular weight polyethylene (UHMWPE) has a variety of industrial and clinical applications due to its superb mechanical properties including ductility, tensile strength, and work‐to‐failure. The versatility of UHMWPE is hindered by the difficulty in processing the polymer into a well consolidated material. This study presents on the effects of shear imparted by equal channel angular pressing (ECAP) on UHMWPE composites containing Nano27 Synthetic Graphite (N27SG). Ductility and work‐to‐failure improvements up to ~60–80% are obtained in sheared N27SG‐UHMWPE composites as compared to non‐sheared N27SG‐UHMWPE controls of the same composition. Microscopy reveals increased fusion at particle boundaries and smaller voids in the sheared materials. Micro‐computed tomography results indicate different distribution of N27SG particulates in ECAP samples as compared to CM indicating enhanced grain boundary interactions. Tradeoffs are not avoided as ECAP samples were lower in conductivity as compared to compression molded (CM) billets of the same weight percent. However, ECAP samples were able to be doped with more N27SG allowing for an ~170% increase in conductivity over CM samples of the same work‐to‐failure. This work shows that ECAP is a viable processing method for obtaining stronger, more ductile conductive composite materials.

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Study of A.C. conductivity and dielectric behaviour of hydrothermally synthesised molybdenum disulphide

Halder

Dey

Sil

et al. 2020

J Mater Sci: Mater Electron

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Dielectric relaxation and ac conduction in γ-irradiated UHMWPE/MWCNTs nano composites: Impedance spectroscopy analysis

Cited by 8 publications

References 40 publications

Effects of hybrid fillers on the electrical conductivity, EMI shielding effectiveness, and flame retardancy of PBT and PolyASA composites with carbon fiber and MWCNT

Effects of hybrid fillers on the electrical conductivity, EMI shielding effectiveness, and flame retardancy of PBT and PolyASA composites with carbon fiber and MWCNT

Shear enhancement of mechanical and microstructural properties of synthetic graphite and ultra‐high molecular weight polyethylene carbon composites

Study of A.C. conductivity and dielectric behaviour of hydrothermally synthesised molybdenum disulphide

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