INTRODUCTIONThere is an increasing interest in the scientific community for the aliphatic and aromatic poly(ester carbonate)s in view of their favorable properties. Many poly(ester carbonate)s are liquid crystalline, transparent, heat and water resistant or dimensionally stable polymer.1,2 Aliphatic poly(ester carbonate)s have been extensively studied and found to be potential biodegradable polymers3–7 and therefore, they have found application in tissue engineering.8,9 Poly(ester carbonate)s which contain 1,4-cyclohexylene ring in the backbone were found tobe mechanically robust polymers having high Tg values.10 The incorporation of increasing amounts of 1,4-cyclohexylene dicarboxylate linkages was found to enhance the segmental mobility and plastic yielding in poly(ester carbonate)s glasses.10–12 Numerous studies have been performed on the synthesis of poly(ester carbonate)s for various applications. The methods used for preparing biodegradable aliphatic poly(ester carbonate) s for biomaterials applications reported in the literature comprise ring opening polymerization of cyclic carbonates with various reagents,13–19 polycondensation of diesters, diphenyl carbonates, and diols,6 polycondensation of diacidswith diols7 and reaction of bisphenols and hydroxy phenyl alkylates with triphosgene.1 Poly(ester carbonate)s were also prepared from the reaction of cyclic esters with cyclic carbonates,20 solid state polymerization or interchange reaction of polyester and polycarbonate oligomers,21,22 solution polymerization of monomethyl carbonate of bisphenols with diacid chlorides23 solution polymerization of bisphenols and diacid chlorides with phosgene24 and by phase-transfer catalysis and modified interfacial polymerization via interfacial phosgenationof aromatic dicarboxylic acids and bisphenols under controlled pH, elevated temperature (70C) and using potassium carbonate base.25