The chemical properties of carbon black

Carbon black production process is different from the chemical properties of the surface, there are differences. Most of the carbon black's surface area greater than the size of the calculated geometric surface area. This is due to the carbon black particle size less than 25nm in particular the carbon black surface there are many pores.

According to the analysis, can be detected in the surface of carbon black such as phenol group, quinone group, carboxyl group, these acidic group concentration in the gas black and furnace black oxide surface is particularly high. In the furnace black can be detected pyrone structure, which determines the basic properties of furnace black. Volatile content can determine the concentration of surface functional groups, but also the polarity of the carbon black can be measured. In addition, as a larger surface area of the carbon black, is easy to absorb moisture in the volatile environment, the carbon black in the transport, storage and use of the process should pay special attention to moisture problems.

Mostly investigated in contact geometry of the conductive particles. The theory is that the greater the amount of carbon black filler, carbon black particles in a dispersed state of carbon black particles or aggregates of greater density, the smaller the average distance between the particles, the higher the chance of contact with each other, carbon black particles or carbon black particles aggregate to form the more conductive paths. Polymers with different polarity of the polarity of the carbon black blend consisting larger critical volume fraction of carbon black greater mean decrease conductivity of the system, because the carbon black surface contain strong polar groups, polar substrate and effects of, when strength increases, but prevent aggregation of the conductive particles themselves, resulting in poor conductivity. However, in multi-component composition of the matrix resin and carbon black blend systems, due to the different polarity of the substrate is different will produce carbon black-filled segregation phenomenon, then the conductivity of carbon black particles depends on the concentration and distribution of phase segregation state, but also on the proportion of the polymer phase segregation.

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