Synthesis of Ultralow-Density Polyethylene Elastomers Using Triarylnaphthyl Iminopyridyl Ni(II)Catalysts  

作　　者：Wenbin Yuan Shengyu Dai 

机构地区：[1]Anhui Laboratory of Molecule-Based Materials,Key Laboratory of Functional Molecular Solids,Ministry of Education,School of Chemistry and Materials Science,Anhui Normal University,Wuhu 241002,China [2]Yueyang Xingchang Petro-Chemical Co.,Ltd.,Yueyang 414021,China

出　　处：《Precision Chemistry》2024年第10期553-558,共6页精准化学（英文）

基　　金：supported by Natural Science Foundation of Anhui Province(2108085Y06).

摘　　要：Recently,the chain-walking ethylene polymerization strategy has garnered widespread attention as an efficient and straightforward method for preparing polyolefin elastomers.In this study,a series of 2,4,8-triarylnaphthyl iminopyridyl nickel catalysts were synthesized and used in ethylene polymerization.These catalysts demonstrated moderate catalytic activity(105 g mol^(−1) h^(−1)),producing high-molecular-weight(up to 145.5 kg/mol)polyethylene materials with high branching degrees(75−95/1000C)and correspondingly low melting points.Detailed analysis using 13C NMR spectroscopy revealed that the polyethylenes primarily featured methyl and long-chain branches.Mechanical testing of the polyethylene samples obtained from catalysts Ni1−Ni3 exhibited moderate stress at break(4.64−6.97 MPa)coupled with a very high strain at break(1650−3752%),indicating their very good ductility.Furthermore,these polyethylenes showcased great elastic recovery abilities,with strain recovery values ranging from 72%to 85%.In contrast,the polyethylene produced by Ni4 displayed notably inferior tensile strength(0.16 MPa)and tensile recovery(43%).To the best of our knowledge,this study represents the inaugural utilization of a nickel iminopyridyl catalyst in the preparation of a polyethylene thermoplastic elastomer.

关 键 词：2 4 8-triarylnaphthyl iminopyridyl Ni(Ⅱ)catalysts polyolefin elastomers ultralow density chain-walking 

分 类 号：O64[理学—物理化学]