Pei Lixia, He San, Gao Jie, Liao Heng, Gao Haiyang
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610550, China.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.
Polymers (Basel). 2017 Jun 30;9(7):262. doi: 10.3390/polym9070262.
A series of bis(β-ketoamino) titanium complexes containing pyrazolone rings (⁻) 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 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 .
一系列含有吡唑啉酮环（⁻）的双（β-酮氨基）钛配合物已被合成、表征，并用作乙烯和降冰片烯均聚和共聚的前体。用甲基铝氧烷（MAO）活化的钛配合物对乙烯（E）均聚生成线性聚乙烯（PE）表现出良好的活性。这些催化剂也制备了具有适度活性的乙烯-降冰片烯共聚物（E⁻N），并详细研究了配体取代基和降冰片烯添加量对共聚物微观结构的影响。通过碳核磁共振（C NMR）和差示扫描量热法（DSC）技术对E⁻N共聚物进行的微观结构分析表明，交替（ENEN）和孤立（ENEE）的降冰片烯主要出现在共聚物链中，并且在由体积较小的催化剂制得的共聚物中也存在NN二元组和NNN三元组序列。
