Study on the synthesis and properties of condensed polynuclear aromatics resin using coal tar pitch as monomer and p-methyl benzaldehyde as cross-linking agent

The condensed polynuclear aromatic (COPNA) resin is synthesized using coal tar pitch as monomer and p-methyl benzaldehyde (PMB) as cross-linking agent in the presence of p-toluene sulfonic acid. Reaction mechanism was studied using FT-IR and ¹H-NMR. The morphologies of COPNA resin were inspected by SEM. TG-DSC was employed to study the thermal behavior of COPNA resin. The results show that coal tar pitch and PMB can be used to synthesize COPNA resin, the reaction mechanism of which is a positive ion-typed condensation polymerization catalyzed by acid. There exist many micro fibers with a uniform distribution in the COPNA resin. The fibers grow with increase of modification time, and then intertwist and amalgamate. Moreover, the COPNA resin possesses good thermo-stability and high coke value.