化学
聚合
水溶液
微乳液
聚合物
催化作用
高分子化学
摩尔质量分布
乙烯
链式转移
活性聚合
共聚物
吡啶
化学工程
有机化学
自由基聚合
工程类
肺表面活性物质
生物化学
作者
Fei Lin,Tobias O. Morgen,Stefan Mecking
摘要
Due to chain transfer events being competitive with chain growth, ethylene polymerization by P,O-chelated Ni(II) complexes usually affords low molecular weight polymers or oligomers. We now show that appropriately bulky substituted phosphinophenolato Ni(II) can polymerize in a living fashion, virtually devoid of chain transfer. Aqueous polymerizations with microemulsions of [κ2-P,O-2-(2-(2',6'-(MeO)2C6H3)C6H4)(Ph)P-6-(3',5'-(CF3)2C6H3)C6H3O-NiMe(pyridine)] (3) at 30 °C yield polyethylenes with narrow molecular weight distributions (Mw/Mn 1.02 to 1.34) and ultrahigh molecular weights (up to 2 × 106) in the form of aqueous nanoparticle dispersions. Catalyst stability and activity are maintained up to 70 °C in water.
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