共聚物
乙烯
催化作用
丙烯酸酯
镍
高分子化学
磷化氢
位阻效应
材料科学
配体(生物化学)
热稳定性
丙烯酸甲酯
化学
有机化学
聚合物
冶金
生物化学
受体
复合材料
作者
Shuoyan Xiong,Alexandria Hong,B.C. Bailey,Heather A. Spinney,Todd D. Senecal,Hannah Bailey,Theodor Agapie
标识
DOI:10.1002/anie.202206637
摘要
Abstract The insertion copolymerization of polar olefins and ethylene remains a significant challenge in part due to catalysts′ low activity and poor thermal stability. Herein we demonstrate a strategy toward addressing these obstacles through ligand design. Neutral nickel phosphine enolate catalysts with large phosphine substituents reaching the axial positions of Ni achieve activity of up to 7.7×10 3 kg mol −1 h −1 (efficiency >35×10 3 g copolymer/g Ni) at 110 °C, notable for ethylene/acrylate copolymerization. NMR analysis of resulting copolymers reveals highly linear microstructures with main‐chain ester functionality. Structure‐performance studies indicate a strong correlation between axial steric hindrance and catalyst performance.
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