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《高分子科学(英文版)》 2018-10
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Enolic Schiff Base Zinc Amide Complexes: Highly Active Catalysts for Ring-Opening Polymerization of Lactide and ε-Caprolactone

Chen-Yang Hu;Ran-Long Duan;Jing-Wei Yang;Shu-Jun Dong;Zhi-Qiang Sun;Xuan Pang;Xian-Hong Wang;Xue-Si Chen;Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Department of Materials Science and Engineering, Jilin University;VIP Department, Stomatological Hospital of Jilin University;  
A series of zinc silylamido complexes based upon NNO tridentate enolic Schiff base framework have been synthesized and characterized. These complexes were tested for the ring opening polymerization of lactide and ε-caprolactone, exhibiting notably high activity at ambient temperature. The influence of imine bridge length and substituents of diketone over the course of polymerization was investigated in details. Remarkably, 4 a was confirmed to be a rare example of exceedingly active and robust zinc catalysts, achieving major transformation of lactide under extremely low loading(0.025 mol%) within 18 min. The influence of various monomers as well as the polymerization mechanism have also been discussed.
【Fund】: financially supported by the National Natural Science Foundation of China(Nos.21574124 51503203 and51233004)
【CateGory Index】: O641.4;O643.36
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