Advances in new methods for synthesis of bisphenol-A polycarbonate

The current situation,technical characteristics and recent progress in three new methods for producing bisphenol-A polycarbonate,including the solid state polycondensation,ring-opening polymerization,and absolute non-phosgene process,were reviewed.The problems and main obstacles in industrial applications presented in these methods were pointed out.The effects of these synthetical technologies on the structure and properties of the produced polymer were discussed,too.The Solid state polycondensation by prepolymer's synthesis and crystallization and then polycondensation of prepolymer in solid state,can obtain crystallized polycarbonate and improve the quality of polycarbonate; the ring-opening polymerization which need first the synthesis of bisphenol A cyclic oligomeric carbonate and then ring-opening polymerization of it,can reach a very high molecule weight; the absolute non-phosgene synthesis which avoids the use of toxic phosgene,is environmentally benign and can obtain high quality polymer,it has very good prospects.