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首页> 外文期刊>Polymers >Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings
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Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings

机译：使用含有吡唑啉酮环的双（β-酮氨基）钛催化剂的乙烯和降冰片烯的同源和共聚

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A series of bis(β-ketoamino) titanium complexes containing pyrazolone rings ( 1 – 3 ) have been synthesized, characterized, and used as precursors for homo- and copolymerization of ethylene and norbornene. The titanium complexes activated with methylaluminoxane (MAO) exhibited good activities for homopolymerization of ethylene (E) to produce linear polyethylenes (PEs). Ethylene–norbornene copolymers (E–N) were also prepared by these catalysts with moderate activities, and influences of ligand substituents and norbornene addition on copolymer microstructure were studied in detail. Microstructure analysis of the E–N copolymers by 13 C NMR and differential scanning calorimetry (DSC) techniques showed that alternating (ENEN) and isolated (ENEE) norbornene predominately appeared in the copolymer chain, and the NN dyad and NNN triad sequences were also present in the copolymers obtained by the less bulky catalyst 1 .
机译：已经合成了含有吡唑啉酮环（1-3）的一系列BIS（β-酮氨基）钛配合物，其特征在一起，并用作乙烯和降冰片烯的均聚物和共聚的前体。用甲基铝氧烷（MAO）活化的钛配合物表现出乙烯（E）的均聚集以产生线性聚乙烯（PE）的良好活性。通过这些催化剂具有中等活性制备乙烯 - 降冰片烯共聚物（E-N），详细研究了配体取代基的影响和降冰片烯加入共聚物微观结构。通过13℃NMR和差示扫描量热法（DSC）技术的E-N共聚物的微观结构分析显示，交替（ENEN）和分离的（ENEE）降冰片烯主要出现在共聚物链中，并且存在NN DYAD和NNN三合会序列在通过较少的催化剂1获得的共聚物中。

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