Carbon Black for Electrically Conductive Polymer Applications

Spahr, Michael E.; Gilardi, Raffaele; Bonacchi, Daniele

doi:10.1007/978-3-642-37179-0_32-2

Cited by 12 publications

(20 citation statements)

References 11 publications

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“…However, it should be remarked that the electrical conductivity observed for the CB quantity in the 9-16 wt.% range is quite limited and far from the intrinsic electrical conductivity values measured for the pressed powders of ENSACO 250G carbon black (c.a. 10 −1 -10 2 S × cm −1 ) [18].…”

Section: Electrical Measurementsmentioning

confidence: 95%

“…Such an electrical percolation threshold position is consistent with the literature data of CB-filled compounds including PC or PS (12-13 wt.% CB), HDPE (16-17 wt.% CB or even higher), and PP-copolymer (c.a. 13-14 wt.% CB) [18,37]. Above these values, called critical filler concentrations [18], the electrical percolation threshold is exceeded and the measured DC electrical conductivity of the composite specimens abruptly jumps up of about 5-6 orders of magnitude, due to the formation of continuous conducting paths in the material.…”

Section: Electrical Measurementsmentioning

confidence: 99%

“…13-14 wt.% CB) [18,37]. Above these values, called critical filler concentrations [18], the electrical percolation threshold is exceeded and the measured DC electrical conductivity of the composite specimens abruptly jumps up of about 5-6 orders of magnitude, due to the formation of continuous conducting paths in the material. In more detail, the DC conductivity (σ) above the percolation threshold was estimated by the conventional power-law model: σ = σ 0 (ф − ф c ) t [38], where σ 0 is a scaling factor, ф is the filler fraction, ф c is the filler percolation threshold, and t is the critical exponent.…”

Section: Electrical Measurementsmentioning

confidence: 99%

“…Among the carbon fillers to be dispersed in polymers, CNTs and graphene have the most notable effect on electrical conductivity, with an electrical percolation threshold ranging between 1 and 4 wt.% [6][7][8][9][10][11][12], while a higher filler loading (c.a. 4-15 wt.%) is usually required to obtain an electrical percolated network with graphite-based materials (graphite flakes, graphite nanoplatelets, expanded graphite, nanographite) [13][14][15], carbon fibers [16], and carbon black [11,17,18]. Conversely, a lower filler content could be enough with a greater dispersion of the functionalized filler and with the use of solvents, additives and compatibilizers [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…The reason for this broad use is certainly attributed to the variety of CB that are available on the market, to the different natures of the CB, and to the so-called carbon black "structure", which is largely used to describe particle aggregates of various sizes and shapes. Such aggregates, with or without branched chains, are obtained during the production step, due to the coalescence of primary particles, which merge together [18]. The CB structure degree can be easily quantified [31] by the small/high amount of dibutyl phthalate (DBP) that can be absorbed (i.e., the greater the absorption value, the higher the structure as scored with the Oil Absorption Number, OAN).…”

Section: Introductionmentioning

confidence: 99%

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Thermal/Electrical Properties and Texture of Carbon Black PC Polymer Composites near the Electrical Percolation Threshold

et al. 2021

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Polycarbonate (PC), a thermoplastic polymer with excellent properties, is used in many advanced technological applications. When PC is blended with other polymers or additives, new properties, such as electrical properties, can be available. In this study, carbon black (CB) was melt-compounded with PC to produce polymer compounds with compositions (10–16 wt.% of CB), which are close to or above the electrical percolation threshold (13.5–14 wt.% of CB). Effects due to nanofiller dispersion/aggregation in the polymer matrix, together with phase composition, glass transition temperature, morphology and textural properties, were studied by using thermal analysis methods (thermogravimetry and differential scanning calorimetry) and scanning electron microscopy. The DC electrical properties of these materials were also investigated by means of electrical conductivity measurements and correlated with the “structure” of the CB, to better explain the behaviour of the composites close to the percolation threshold.

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Section: Electrical Measurementsmentioning

confidence: 95%

Section: Electrical Measurementsmentioning

confidence: 99%

Section: Electrical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal/Electrical Properties and Texture of Carbon Black PC Polymer Composites near the Electrical Percolation Threshold

et al. 2021

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Polyvinylidene fluoride/polysulfone/air plasma defected hexagonal boron nitride emerging nano blends for electrostatic dissipation

Humbe

Joshi

Deshmukh

et al. 2022

J of Applied Polymer Sci

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In the present era electrostatic dissipation (ESD) property is crucial for packaged electronic device to protect from humidity over long duration. It was important to control the ESD for better integrated packaged electronic gadgets. Polymer blends and composites were modified with nano fillers as a promising area for ESD applications. In the present investigation, polyvinylidene fluoride (PVDF)/polysulfone (PSF) was modified by untreated (UT) and air plasma treated (PT) hexagonal boron nitride (h‐BN) by solution dispersion method. Spherulitic morphology of nano blends was foreseen through scanning electron microscopy. Surface topography was investigated by atomic force microscopy. Surface roughness was decreased due to plasma exposure. Phonon vibrations and Raman active mode of nano blends were confirmed by Raman spectroscopy mutually supporting ESD phenomenon. Increased electrical conductivity and semicircular impedance pattern of modified blends reveals an excellent ESD property disclosed by impedance spectroscopy. Moderate increased surface energy and decreased relative contact angle of modified blends may be due to the incorporation of polar groups during plasma exposure was confirmed by surface goniometer. Mechanical properties of nano blends were evaluated by universal testing machine. Increased 10–27% tensile strength and 34–55% Young's modulus of plasma treated admix composition. Softness of polymer nano blends was increased (20%) due to excellent interaction of filler and polymer host system were tested by Shore “A” durometer. Increased glass transition temperature (Tg = 16 and 30°C as function of treatment time) in view of thermal stability of modified nano blends were analyzed by thermogravimetric technique. Hence the PT h‐BN dispersed PVDF/PSF emerging polymer nano blends would be a choice for the new development for electrostatic dissipation applications.

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