Unifying Molecular Weights of Highly Linear Polyethylene Waxes through Unsymmetrical 2,4-Bis(imino)pyridylchromium Chlorides
作者:Badral Gansukh、Qiuyue Zhang、Chantsalnyam Bariashir、Arumugam Vignesh、Yanping Ma、Tongling Liang、Wen-Hua Sun
DOI:10.3390/molecules25235584
日期:——
distorted-octahedral geometry around the chromium center. Activated by either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), all the chromium catalysts exhibited high activities toward ethylene polymerization with the MMAO-promoted polymerizations far more productive than with MAO (20.14 × 106 g (PE) mol−1 (Cr) h−1 vs. 10.03 × 106 g (PE) mol−1 (Cr) h−1). In both cases, the resultant polyethylenes
通过将 CrCl3∙3THF 与相应的配体 (L1-L5) 处理,一系列带有 2-[1-(2,4-dibenzhydryl-6-fluoro-phenylimino) 的氟取代的氯化铬 (Cr1-Cr5) (Cr1-Cr5)乙基]-6-[1-(芳基亚氨基)乙基]吡啶(芳基 = 2,6-Me2Ph Cr1, 2,6-Et2Ph Cr2, 2,6-iPr2Ph Cr3, 2,4,6-Me3Ph Cr4, 2,6 -Et2-4-MePh Cr5) 以良好的收率合成,并通过傅里叶变换红外 (FT-IR) 光谱和元素分析进行验证。除了常规表征外,单晶 X 射线衍射研究揭示了配合物 Cr2 和 Cr4 的固态结构,作为围绕铬中心的扭曲八面体几何形状。由甲基铝氧烷 (MAO) 或改性甲基铝氧烷 (MMAO) 活化,所有铬催化剂都对乙烯聚合表现出高活性,MMAO 促进的聚合反应远比 MAO 高得多(20