文献类型：期刊文献

英文题名：Polyethylene-b-poly(ethylene/l-octene) Block Copolymer Prepared via Novel Dinuclear FI/Nickel (II) α-Diiminecatalytic Systems

作者：Zhang Yixin[1];Wang Mengxue[1];Zhang Zheyuan[1];Mi Puke[1];Wang Tinglan[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat, Minist Educ,Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：38

期号：8

起止页码：1497

外文期刊名：CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000408703000028)】；

基金：Supported by the National Key R&D Program of China(No.2017YFB0306701) and the Project of Shanghai Key Disipline and Laboratory, China(Nos.B502, 08DZ2230500).

语种：英文

外文关键词：Block copolymer; Nickel(II) alpha-diimine catalyst; Phenoxyimine zirconium catalyst; Chain shuttling polymerization

摘要：A novel dinuclear phenoxyimine zirconium catalyst (CatB) was synthesized and constituted catalytic system with nickel(II) alpha-diimine catalyst(CatA). The catalytic system was used for the preparation of polyethylene-b-poly (ethylene/l-octene) copolymer in the presence of co-catalyst (MAO) and chain shuttling agent diethylzinc (ZnEt2). Polymer structure was characterized by differential scanning calorimetry (DSC), Fourier transform infrared spectrophotometer (FTIR) and carbon nuclear magnetic resonance (C-13 NMR). The results showed that under the same condition; toluene as solvent, pressure 1.0 MPa, temperature 50 degrees C, n (MAO)/n (CatA+CatB) = 300 : 1, c(1-octene) = 0.58 mol/L, the insert amount of 1-octene on copolymer was 4.9%. The DSC curve presented bimodal profile and the "soft" segment of the products was more concentrated.