Highly cis-1,4 selective polymerization of isoprene catalyzed by Co(Ⅱ) complexes bearing α-diimine ligands
In 1995, late transition-metal complexes containing a-diimine ligands, discovered by Brookhart exhibited very good activity for olefin polymerization,1 the late-transition-metal catalysts for ethylene and linear a-olefins polymerization has received increasing attention from both academia and industry.2-4 However, N^N bidentate Co(Ⅱ)complexes bearing a-diimine ligands for isoprene polymerization have not been reported yet to the best of our knowledge.Compared with the N^N^N tridentate ligand,the a-diimine ligand gives the metal complex a more open coordinated environment due to less steric hindrance.5 A series of a-diiminecobalt complexes and dichloride ethylaluminum (AlEtCl2) catalyst system were employed for isoprene polymerization and they showed high selectivity for cis-1,4 polyisoprenes (cis-1,4 PIs, up to 94％).The resulting PIs possessed low molecular weights and narrow polydispersity, which could be useful as coating additive and in other application.
Xinxin Wang Linlin Fan Shizhen Du Cun-Yue Guo Wen-Hua Sun
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, 19A Yuquan Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science,Institu School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, 19A Yuquan
国际会议
9th International Symposium on High-Tech Polymer Materials(第9届国际高技术高分子材料学术会议)(HTPM-9)
郑州
英文
104-104
2016-07-11（万方平台首次上网日期，不代表论文的发表时间）