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《高分子科学(英文版)》 2016-09
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Polymerization of 1,3-Butadiene Catalyzed by Cobalt(Ⅱ) and Nickel(Ⅱ) Complexes Bearing Pyridine-2-imidate Ligands

Heng Liu;Shi-ze Yang;Feng Wang;Chen-xi Bai;Yan-ming Hu;Xue-quan Zhang;Key Laboratory of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences;Panjin Northern Asphalt Co., Ltd, Norinco Group;  
Cobalt and nickel complexes(1a-1d and 2a-2d, respectively) supported by 2-imidate-pyridine ligands were synthesized and used for 1,3-butadiene polymerization. The complexes were characterized by IR and element analysis, and complex 1a was further characterized by single-crystal X-ray diffraction. The solid state structure of complex 1a displayed a distorted tetrahedral geometry. Upon activation with ethylaluminum sesquichloride(EASC), all the complexes showed high activities toward 1,3-butadiene polymerization. The cobalt complexes produced polymers with high cis-1,4 contents and high molecular weights, while the nickel complexes displayed low cis-1,4 selectivity and the resulting polymers had low molecular weights. The catalytic activities of the complexes highly depended on the ligand structure. With the increment of polymerization temperature, the cis-1,4 content and the molecular weight of the resulting polymer decreased.
【Fund】: financially supported by the 973 Program(No.2015CB654700 or 2015654702);; the National Natural Science Foundation of China(Nos.51473156 and 51203147)
【CateGory Index】: TQ316.3
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