Transesterification Between Diphenyl Carbonate and 1,6-Hexandiol Catalyzed by Metal-Organic Frameworks Based on Zn~(2+) and Different Aromatic Carboxylic Acids

摘要

Metal-organic frameworks based on metal ion Zn~(2+) and different aromatic carboxylic acid ligands were prepared by the solvothermal method and characterized by X-ray diffraction and Fourier transform infrared spectroscopy. They were then used as the catalysts for the preparation of polycarbonate diol via the transesterification between diphenyl carbonate and 1,6-hexandiol. Their catalytic activities in the transesterification process were evaluated by the yield of phenol and their catalytic activities in the polycondensation process were determined by the number-average molecular weight (M?) and the hydroxyl value. The experimental results show that metal-organic frameworks made from Zn~(2+) with benzene- 1,4-dicarboxylic acid and benzene-1,3,5-tricarboxylic acid exhibit higher catalytic activities than metal-organic frameworks made from Zn~(2+) with benzene-1,3-dicarboxylic acid and benzene-1,2-dicarboxylic acid for the preparation of poiyoarbonate diol.