ETHYLENE HOMOPOLYMERIZATION WITH P,O-CHELATED NICKEL-CATALYSTS
ETHYLENE HOMOPOLYMERIZATION WITH P,O-CHELATED NICKEL-CATALYSTS
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DOI：
10.1002/pola.1987.080250719
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发表时间：
1987-07-01
影响因子：
--
通讯作者：
ITTEL, SD
中科院分区：
文献类型：
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作者：
KLABUNDE, U;MULHAUPT, R;ITTEL, SD
从镍（II）P，O-螯合络合物Ni[Ph 2 PCH <$C（Ph）O]（Ph）（PPh 3）和相关物质中提取膦将它们从烯烃低聚转化为烯烃聚合催化剂。膦受体如Rh（acetylacetonate）（C2 H4）2或Ni（1，5-cyclooctane）2是最有效的。或者，可以制备其中膦配体被弱配位的吡啶取代的镍络合物。这些活性的均相催化剂可以调节以得到低或高分子量、线性低或高密度聚乙烯。取决于稀释剂，相同的催化络合物可用作多相或均相催化剂。它们耐受会使正常的基于前过渡金属的齐格勒-纳塔催化剂中毒的含氧、羟基或极性分子。事实上，聚合可以在溶剂如乙醇或丙酮中进行，但优选烃溶剂。
Abstraction of phosphine from the nickel(II) P, O‐chelated complexes, Ni[Ph2PCHC(Ph)O] (Ph)(PPh3), and related species converts them from olefin oligomerization to olefin polymerization catalysts. Phosphine acceptors such as Rh(acetylacetonate)(C2H4)2or Ni(1,5‐cyclooctadiene)2are most effective. Alternatively, nickel complexes in which the phosphine ligand is replaced with weakly coordinated pyridine can be prepared. These active, homogeneous catalysts can be tuned to give either low or high molecular weight, linear low or high density polyethylene. Depending on the diluent, the same catalytic complex can be used as heterogeneous or homogeneous catalyst. They are tolerant of oxygenated, hydroxylic, or polar molecules that would poison normal early transition metal‐based Ziegler‐Natta catalysts. In fact, the polymerizations can be run in solvents such as ethanol or acetone, but hydrocarbon solvents are preferred.