Zirconium complexes bearing phenoxy/cyclopropyl-, cyclobutyl- or cyclopentyl-imine chelate ligands, when activated with methylalumoxane (MAO), produced vinyl-terminated low molecular weight polyethylenes (Mw<5000) with higher activities than Cp2ZrCl2 at 25 °C. The complex having a cyclobutyl group provided the lowest molecular weight polyethylene (Mw 2100).
含有苯氧基/环丙基、
环丁基或环戊基
亚胺螯合
配体的
锆络合物在用甲基铝氧烷(MAO)活化时,可生成
乙烯基封端的低分子量聚
乙烯(Mw<5000),在 25 ℃ 下的活性高于 Cp2ZrCl2。具有环丁基的复合物提供了分子量最低的聚
乙烯(Mw 2100)。