초록
In order to introduce a functionality to coal tar pitch, dienophiles such as p-benzoquinone(BQ) and maleic anhydride(U) were used in the chemical modification reaction. The coal tar pitch was reacted with BQ or MA at 160℃ under nitrogen atmosphere. Thermal behavior of'the reaction product was examined by sofiening point measurement and thermogravimetric analysis(TGA) under nitrogen atmosphere. TGA results revealed that the weight loss of the reaction product is reduced with the amount of BQ used in the reaction. The result comes fiom the formation of intermolecular cross links between the pitch molecules. The sofiening point of the reaction products increased with the amount of the BQ or MA used in the reaction. BQ was more effective than MA in increasing the sofiening point of coal tar pitch. The coal tar pitch ryacted with 200wt% BQ showed dimensional stability with heat treatment up to 500℃. The concentration ewut of BQ and MA on solubility in various solvents was tested by sequential extraction method. The insoluble fiaction of the reaction product increased with increase of BQ, whereas M showed an opposite effect. On the basis of courier transform-infiared(FT-lR) spectroscopic result, BQ acts not only as a dienophile of Diels-Alder reaction agent but also as a crosslinking agent, whereas H acts mainly as a dienophile.
