含吸电子基团配体的α-二亚胺-NiⅡ上乙烯聚合反应性能-催化学报.PDFVIP

2011 Chinese Journal of Catalysis Vol. 32 No. 3 文章编号: 0253-9837(2011)03-0490-05 DOI : 10.3724/SP.J.1088.2011.01040 研究论文: 490~494 含吸电子基团配体的 α-二亚胺-Ni( Ⅱ) 上乙烯聚合反应性能 袁建超, 王学虎, 刘玉凤, 梅铜简 西北师范大学化学化工学院, 生态环境相关高分子材料教育部重点实验室, 甘肃省高分子材料重点实验室, 甘肃兰州 730070 摘要：合成了一种新型的含溴 α-二亚胺配体及其 Ni 配合物, 并采用核磁共振氢谱、核磁共振碳谱、元素分析、傅里叶变换红 外光谱和 X 射线光电子能谱进行了表征. 同时以二乙基氯化铝为助催化剂用于乙烯聚合反应, 考察了温度、Al/Ni 摩尔比和配体 结构对聚合反应性能的影响. 结果表明, 在 25 ºC, Al/Ni 摩尔比为 600 时, 该催化剂活性最高, 可达 3.73 × 107 g/(mol·h·MPa), 与不含 吸电子基团 Br 的同类催化剂活性相当, 且催化剂热稳定性和产物聚乙烯支化度明显提高. 关键词：α-二亚胺; 镍; 配合物; 后过渡金属催化剂; 二乙基氯化铝; 乙烯; 聚合; 聚乙烯 中图分类号：O643 文献标识码：A Catalytic Properties of α-Diimine-Ni (II) Catalyst Containing Electron Withdrawing Substituent for Ethylene Polymerization * YUAN Jianchao , WANG Xuehu, LIU Yufeng, MEI Tongjian Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Gansu Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China Abstract: A new Br-substituted α-diimine ligand and its corresponding Ni(II) complex, {bis[N,N ′-(4-bromo-2, 6-dimethylphenyl)imino] acenaphthene}dibromonicke (2) were successfully synthesized and characterized by 1H and 13C nuclear magnetic resonance, elemental analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The catalytic system, complex 2/diethylaluminium chloride (DEAC) showed higher activity for ethylene polymerization. The highest activity (3.73 × 107 g/(mol·h·MPa)) was obtained with the Al/Ni molar r