INFLUENCE OF PYRIDINE-BORANE MODIFICATION ON THE PROPERTIES AND COMPONENT OF PITCHES

Coal tar pitch was modified by adding pyridine borane. The effect of reaction conditions on the properties and components of modified pitches was investigated. It was found that pyridine borane participate in and accelerated the reaction among molecules, but changed the component and structure of pitches. The softening points, carbon yields and PI fraction content increased with the increasing of boron addition and reaction temperature, while TS fraction content of pitches decreased. Compared with the pure pitches, pyridine borane modified pitches had higher softening points, carbon yields and PI fraction content at the same reaction conditions.