Preparation of PBO was carried out by polymerization of salts that contained 4,6-diamino resorcinol dihydrochloride(DAR) and terephthalic acid(TPA) in polyphosphoric acid(PPA) and P2O5.

• 以4,6-二氨基间苯二酚盐酸盐(DAR)和对苯二甲酸(TPA)制成复合盐,再以多聚磷酸为溶剂,添加五氧化二磷,制备出PBO聚合物。