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Copolycarbonates of isosorbide and various diols



Isosorbide and equimolar amounts of various diols were polycondensed with diphosgene and pyridine. Bisphenol A, 3,3′-dimethyl bisphenol A, bisphenol C, 1,3-bis(4-hydroxybenzoyloxy)propane, and 1,4-cyclohexane diol were used as comonomers. The compositions were determined by 1H NMR spectroscopy; the random sequences were characterized by 13C NMR spectroscopy. For the high-molar-mass copolycarbonates of bisphenol A, 3,3′-dimethyl bisphenol A, and bisphenol C, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry proved that the chain growth was mainly limited by cyclization. Copolycarbonates with alternating sequences were obtained by the polycondensation of bisphenol A with isosorbide bischloroformiate or from isosorbide and bisphenol A bischloroformiate. In these cases, large amounts of cyclic oligo- and polycarbonates were also formed. The glass-transition temperatures were determined by differential scanning calorimetry measurements. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3616–3628, 2006