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In the presence of 5 wt% of p-toluenesulfonic acid (TsOH), the mixture (TPA/PR = 1.5/1.0) of pyrene (PR) and terephthalaldehyde (TPA) was heated at 160 °C for 1.5 h under nitrogen to give the condensed polynuclear aromatic (COPNA) resin. It was transformed to an infusible and insoluble solid by further heating at 300 °C for 1 h. The obtained material was treated with sulfuric acid at 80 °C for 15 h...
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