Polycarbonate based multi-block copolymers were prepared by the reaction of phosgene with the mixtures of bisphenol-A and poly(tetramethylene)glycol in the presence of the triethylamine. The resulting copolymer were studied in detail for property-structure effects as a function of glycol and copolymer composition 10∼70wt(%) of a polymeric glycol. It is suggested that the observed viscosity and thermal property property effects result a large extent from the variation in poly(bisphenol-A carbonate)block length accompanies the changing of polymer composition. PC-oligomer with softening point(190℃) was prepared by interfacial polymerization of mol ratio phosgene/BPA:0.9. PTMG-bischloroformate was prepared by two reactants mol ratio, phosgene/PTMG : 6.0, From IR spectrum peak of OH group disappeared perfectly. PC-PTMG block copolymers having two different chemical properties were prepared by reaction of acyl chlorides terminated-PTMG from mixtures of PC oligomer or BPA. Syntheses of these copolyesters required polycondensation catalysts. The catalysts based on triethylamine and phase transfer agents based on TBAC 0.1 wt(%) was found to be more effective than those based on non-catalysts. Depending on the contents and addition rate of PTMG-bischloroformate, reaction temperature, time was applied. As the contents of PTMG increases, thermal decomposition initial temperature of the copolymers decreases linearly.
