Homogeneous catalysts for ethylene polymerization based on bis(imino)pyridine complexes of iron, cobalt, vanadium and chromium
Homogeneous catalysts for ethylene polymerization based on bis(imino)pyridine complexes of iron, cobalt, vanadium and chromium
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DOI：
10.1016/j.cattod.2009.01.022
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发表时间：
2009-06
期刊：
影响因子：
5.3
通讯作者：
N. V. Semikolenova;V. Zakharov;Ljudmila G. Echevskaja;M. Matsko;K. Bryliakov;E. P. Talsi
中科院分区：
文献类型：
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作者：
N. V. Semikolenova;V. Zakharov;Ljudmila G. Echevskaja;M. Matsko;K. Bryliakov;E. P. Talsi
报道了具有紧密配体骨架和不同过渡金属中心(Fe(II)、Co(II)、Cr(III)和V(III))的双(亚氨基)吡啶配合物均相催化剂上乙烯聚合活性和聚乙烯(PE)结构的比较研究结果。研究了激活剂性质和聚合条件对这些络合物的活性和所得PE结构(相对分子质量、分子量分布、甲基和乙烯基含量)的影响。在可比条件下得到的实验数据表明，过渡金属中心对双(亚胺)吡啶配合物的催化性能(聚合活性、共聚反应活性、热稳定性、PE结构、最佳活化剂组成、单位或多位催化体系的形成)有显著影响。
Results of a comparative study of ethylene polymerization activity and the structure of polyethylene (PE) produced over homogeneous catalysts based on bis(imino)pyridine complexes with close ligand frameworks and different transition metal centers (Fe(II), Co(II), Cr(III) and V(III)) are reported. The effects of the activator nature and polymerization conditions on the activity of these complexes and the resulting PE structure (molecular weight, molecular weight distribution, content of methyl and vinyl groups) have been studied. The experimental data obtained under comparable conditions demonstrate a pronounced effect of transition metal center on the catalytic properties of bis(imino)pyridine complexes (polymerization activity, copolymerization reactivity, thermal stability, PE structure, composition of optimal activator, formation of single-site or multiple-site catalytic system).