Low electrical percolation threshold in poly(ethylene terephthalate)/multi-walled carbon nanotube nanocomposites

Logakis, E.; Pissis, P.; Pospiech, Doris; Korwitz, Andreas; Krause, Beate; Reuter, Uta; Pötschke, Petra

doi:10.1016/j.eurpolymj.2010.01.023

Cited by 98 publications

(68 citation statements)

References 34 publications

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“…They ascribed this performance to the formation of functional groups and defects sites on the surface of the A-MWCNTs after modification process using acid treatment. According to the literature, the lowest U c for PET/AMWCNTs nanocomposites was reported at 0.06 wt% by Logikis et al who used an in situ polymerization method to prepare samples [26]. Whereas same authors reported U c at 0.2 wt% for the same nanocomposite when made by melt compounding.…”

Section: Electrical Conductivity and Percolation Threshold Valuesmentioning

confidence: 90%

Impact of carbon nanotubes addition on electrical, thermal, morphological, and tensile properties of poly (ethylene terephthalate)

Alshammari

Wilkinson

2016

Appl Petrochem Res

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In this study, multi-walled carbon nanotubes (MWCNTs) were incorporated into poly (ethylene terephthalate) (PET) matrix in their as-received (A-MWCNTs) and treated (T-MWCNTs) forms. Melt-compounding method was used for the preparation of these carbon nanotubes (CNTs)-reinforced PET composites. The electrical conductivity, thermal stability, morphological, and tensile properties were investigated. For testing and characterization, impedance spectroscopy, thermo-gravimetric analysis, scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared spectroscopy and tensile testing were utilized. The results demonstrates that an incorporation of *0.25 wt% A-MWCNTs, an electrically conductive polymer nanocomposite (*0.2 S/m), was formed with a low percolation threshold (*0.33 wt%). In contrast, at the same loading of T-MWCNTs or even up 2 wt% did not yield conductive polymer. Presumably, such behavior is attributed to the acid treatment that disrupted the inherent electrical conductivity of the CNTs and also reduced their aspect ratio. Nevertheless, T-MWCNTs showed a better dispersion and distribution into the PET matrix than that of A-MWCNTs counterpart. Moreover, an improved tensile behavior was observed for T-MWCNTs incorporated composites than that of A-MWCNTs counterpart. Improved thermal stability was observed for PET/ A-MWCNTs in both the air and nitrogen atmospheres. Whereas, PET/T-MWCNTs exhibited the highest thermal stability in all samples in nitrogen atmosphere. However, poor thermal response was seen in air atmosphere.

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Section: Electrical Conductivity and Percolation Threshold Valuesmentioning

confidence: 90%

Impact of carbon nanotubes addition on electrical, thermal, morphological, and tensile properties of poly (ethylene terephthalate)

Alshammari

Wilkinson

2016

Appl Petrochem Res

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“…The AC conductivity (Figure 8) was calculated from the measured dielectric loss by means of Eq. (10) [54].…”

Section: Electrical Propertiesmentioning

confidence: 99%

Preparation and properties of thermally conductive polypropylene composites

Standau¹

2016

Zeitschrift Kunststofftechnik

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“…An idea of how the values of volume resistivity from samples prepared in this study are related to the typical percolation thresholds of similar systems could be got from Figure 7. Samples 1-6 refer to published data [12,43,49,[52][53][54][55], whereas sample 6 represents the compatibilizer material used in this study, and samples 7-10 are from the present study. In the majority of cases the conductive filler is dispersed in the polymer bulk ( Figure 7 demonstrate the extremely strong dependence of the volume resistivity on the concentration of the filler -a change of CNT concentration by 1 vol% can result in a decrease of the resistivity by up to 10 orders of magnitude.…”

Section: Electrical Properties Of the Blend Pphv/pet/(pp-g-ma/cnt)mentioning

confidence: 99%

Conductivity of microfibrillar polymer-polymer composites with CNT-loaded microfibrils or compatibilizer: A comparative study

Panamoottil¹,

Pötschke²,

Lin³

et al. 2013

Express Polym. Lett.

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Conductive polymer composites have wide ranging applications, but when they are produced by conventional melt blending, high conductive filler loadings are normally required, hindering their processability and reducing mechanical properties. In this study, two types of polymer-polymer composites were studied: i) microfibrillar composites (MFC) of polypropylene (PP) and 5 wt% carbon nanotube (CNT) loaded poly(butylene terephthalate) (PBT) as reinforcement, and ii) maleic anhydride-grafted polypropylene (PP-g-MA) compatibilizer, loaded with 5 wt% CNTs introduced into an MFC of PP and poly(ethylene terephthalate) (PET) in concentrations of 5 and 10 wt%. For the compatibilized composite type, PP and PET were melt-blended, cold-drawn and pelletized, followed by dry-mixing with PP-g-MA/CNT, re-extrusion at 200°C, and cold-drawing. The drawn blends produced were compression moulded to produce sheets with MFC structure. Using scanning electron microscopy, CNTs coated with PP-g-MA could be observed at the interface between PP matrix and PET microfibrils in the compatibilized blends. The volume resistivities tested by four-point test method were: 2.87•108 and 9.93•107 Ω•cm for the 66.5/28.5/5 and 63/27/10 (by wt%) PP/PET/(PP-g-MA/CNT) blends, corresponding to total CNT loadings (in the composites) of 0.07 vol% (0.24 wt%) and 0.14 vol% (0.46 wt%), respectively. For the non-compatibilized MFC types based on PP/(PBT/CNT) with higher and lower melt flow grades of PP, the resistivities of 70/(95/5) blends were 1.9•106 and 1.5•107 Ω•cm, respectively, corresponding to a total filler loading (in the composite) of 0.44 vol% (1.5 wt%) in both MFCs

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Low electrical percolation threshold in poly(ethylene terephthalate)/multi-walled carbon nanotube nanocomposites

Cited by 98 publications

References 34 publications

Impact of carbon nanotubes addition on electrical, thermal, morphological, and tensile properties of poly (ethylene terephthalate)

Impact of carbon nanotubes addition on electrical, thermal, morphological, and tensile properties of poly (ethylene terephthalate)

Preparation and properties of thermally conductive polypropylene composites

Conductivity of microfibrillar polymer-polymer composites with CNT-loaded microfibrils or compatibilizer: A comparative study

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