10-Arylimino-5,6,7,8,9-pentahydrocyclooctapyridylnickel Halides: Their Synthesis, Characterization and Reactivity Toward Ethylene Polymerization
N,N-Bidentate nickel complexes have been extensively investigated toward ethylene polymerization.1 The 8-arylimino-5,6,7-trihydroquinolyl nickel dichlorides2 and 9-aryliminocycloheptapyridyl nickel chlorides 3developed by our group showed high activities and for ethylene polymerization with producing the highly branched polyethylene in narrow polydispersity.Interestingly in both case they exhibited higher activities than the 2-iminopyridyl nickel analogues4 due to the enhancement of the ring-tension of cyclic-fused pyridine.In order to further explore the influence of ring size changing of cycloalkyipyridyl ring on ethylene polymerization, in this work the 6,7,8,9-tetrahydrocyclooctabpyridin-10(5H)-one was designed and prepared to form the corresponding imino-derivatives, which were used to react with nickel bromide to synthesize the title complexes.Upon the activation of the co-catalysts of methylaluminoxane (MAO) or diethylaluminium chloride (Et2AlCl),all nickel complexes exhibited high activities towards ethylene polymerization and produced polyethylene waxes with low molecular weights and narrow polydispersities (1.7-2.4) that was indicative of single-site catalytic systems.Comparing with the results by their cycloheptapyridine and cyclohexapyridine analogues, activity are little bit lower.In addition, the PEs morphology in appearance were found to significantly rely on the substituent of the ligands and polymerization parameter.The detail will be presented in the conference.
Randi Zhang Zheng Wang Xinxin Wang Wen-Hua Sun
Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences,Beijing 100190, China
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
108-108
2016-07-11（万方平台首次上网日期，不代表论文的发表时间）