9,9-Bis (4-hydroxyphenyl) fluorene is synthesized with heteropoly acid instead of inorganic acid as the catalyst, which has great significance for environmental protection. In this experiment, the synthesis of 9,9-bis (4-hydroxyphenyl) fluorene is studied by using fluorenone and phenol as raw materials, using homemade heteropoly acid 11-tungsten-titanium titanium (molecular formula H4Ti(H2O)TiW11O39) as the catalyst and 3-mercaptopropionic acid as the cocatalyst. The structure of the catalyst was characterized. The effect of the molar ratio of raw material, reaction temperature, reaction time, and the dosage of catalyst and cocatalyst on the purity and yield of 9,9-bis(4-hydroxyphenyl) fluorene are investigated, and the best reaction conditions are obtained. The results show that the new catalyst has a good catalytic effect, and the product has good quality and a high yield.

Polycarbonate is a widely used thermoplastic engineering plastic with excellent properties. Using triphosgene and Bisphenol A as raw materials, polycarbonate is synthesized by interfacial polycondensation. The effects of catalyst dosage, molar ratio of raw material, reaction temperature and reaction time on the molecular weight of the product are investigated, and the optimal reaction conditions are obtained. The structure of the product is verified by infrared absorption spectroscopy. The rotary viscometer measures the intrinsic viscosity of the sample and calculates the viscosity average molecular weight of the sample to be 50000. The glass transition temperature of the product is detected to be 148.5 °C by dilatometer. The polycarbonate synthesized by the new method meets the quality requirements.

Bisphenol S replaces bisphenol A to synthesize bisphenol S polycarbonate, which introduces the sulfone group in polycarbonate, improves the heat resistance and flame resistance of polycarbonate, and expands its application field. In this experiment, bisphenol S reacts with triphosgene to synthesize bisphenol S polycarbonate by interface polycondensation method. The effects of various factors on the product’s molecular weight are investigated and the optimal conditions of reaction are obtained. Through the infrared absorption spectrum, we verify the product structure. Through the Ubbelohde viscometer, the maximum viscosimeter molecular weight is measured and calculated to be 18500. Through the dilatometer, we detect the product’s temperature of glass transition at 166.5°C, which indicates that bisphenol S polycarbonate has good heat resistance. The limiting oxygen index of the product is 33.5%, and the combustion performance level reaches V-0, which indicates that bisphenol S polycarbonate has good flame retardancy.