Study on the relation of solvent extractable material and resistivity of pyrolysed coal

Changes in electrical and dielectric properties along with yield of the material extracted with pyridine and chloroform depending on the temperature of pyrolysis were analyzed for the two samples of coals with different ranks.The material soluble in pyridine but insoluble in chloroform and the material soluble in chloroform were investigated with Fourier transform infrared spectroscopy (FT-IR) method using attenuated total reflection techniques (ATR).It was stated that an anomalous course of the changes in resistivity of pyrolysates, which were separated from the zones of the charge being plasticized, was related with the existence of low molecular compounds in the supramolecular structure of pyrolysates. These low molecular compounds functionate as dielectrics and block the transport of electric charge in the carbon matrix.