Influence of dispersing additives on the conductivity of carbon black pigment dispersion

Journal of Coatings Technology and Research (Impact Factor: 1.3). 10/2011; 8(5):553-561. DOI: 10.1007/s11998-011-9330-5

ABSTRACT The influence of dispersing additives on the electrical conductivity of carbon black pigments dispersed in an organic medium
was studied. Two dispersing additives were examined in combination with two different carbon blacks, a conductive carbon black
and a nonconductive one. These carbon blacks differ in the size of their aggregates and in the amounts of surface oxygen groups.
Both of the additives form a monolayer when adsorbed on either of the pigment surfaces. FTIR studies showed that chemical
bonding of one of the additives on the surfaces of both pigments had occurred. Conductivity decreases with increasing additive
concentration, but in the case of the chemically bonded additive, the conductivity of the dispersion remained high even at
higher additive loadings. This study helps in understanding the effects such additives have on the specific conductivity of
composite materials that contain dispersed carbon black pigment particles.

KeywordsCarbon black–Dispersion–Adsorption–Conductivity

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Available from: Marija Bester-Rogac, Apr 07, 2014
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    ABSTRACT: The properties of carbon black surfaces which might affect their influence on the conductivity of dispersions in polar and non-polar media were analysed. Low-structured furnace black, high-structured gas black and extremely high-structured extra-conductive carbon black were studied. The size distribution of aggregates was measured. Raman spectroscopy provides relative amounts of disordered, graphitic and amorphous phases, and the lateral size of crystallites. X-ray photoelectron spectroscopy gives the oxygen content and the nature of functional groups on particle surfaces. The chemical nature of surface functional groups was analysed with infrared spectroscopy. All samples are disordered carbon blacks with different amounts of oxygen on their surfaces. The carbonyl-based surface groups were obtained on the acidic sample and other oxygen groups on the alkaline ones. A negligible amount of oxygen combined with a high amount of the graphitic phase and alkaline nature gives high conductivity of carbon black in polar and non-polar solvents. The conductivity of dispersion also increases with a higher structure, i.e. larger aggregates with a wide size distribution.
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