Heterogeneousα-Diimine Nickel Catalysts with Improved Catalytic Performance in Ethylene Polymerization  

作　　者：Zhanshan Ma Mengli Xu Ningning Zhu Chen Tan Changle Chen 

机构地区：[1]CAS Key Laboratory of Soft Matter Chemistry,Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei,Anhui 230026,China [2]Institutes of Physical Science and Information Technology,Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education,Key Laboratory of Environment-Friendly Polymeric Materials of Anhui Province,Anhui University,Hefei,Anhui 230601,China

出　　处：《Chinese Journal of Chemistry》2023年第10期1155-1162,共8页中国化学（英文版）

基　　金：supported by National Key R&D Program of China(No.2021YFA1501700);the National Natural Science Foundation of China(Nos.52025031,22001004,22261142664,U19B6001,U1904212).

摘　　要：Heterogenization can improve the thermal tolerance of olefin polymerization catalysts and result in good product morphology con-trol,which are two important parameters for industrial polyethylene production.In this work,α-diimine nickel catalysts bearing-OH or-ONa anchoring groups were designed and prepared.The anchoring groups can enable facile heterogenization of the cata-lysts on silica.The heterogeneous catalysts demonstrated enhanced thermal stabilities,along with high catalytic activity at 120℃(up to 5.5×10^(6)g·PE·mol·Ni^(-1)·h^(-1)).Furthermore,the heterogenization process results in the improvements of many other parame-ters,including polymer morphology control,catalytic activity(up to 1.9×10^(7)g·PE·mol·Ni^(-1)·h^(-1))and polyethylene molecular weight(Mn up to 2.3×10^(6)g·mol^(-1)).More importantly,the structure and properties of the polymer products can be controlled by catalyst structures,polymerization conditions and heterogenization to achieve good mechanical properties and elasticity.

关 键 词：Ethylene polymerization Mechanical properties NICKEL Supported catalysts Heterogeneous catalysis POLYMERIZATION MORPHOLOGY 

分 类 号：TQ221.11[化学工程—有机化工] O643.36[理学—物理化学]