Controlled Polymerization in Polar Solvents to Ultrahigh Molecular Weight Polyethylene
作者:Philip Kenyon、Melissa Wörner、Stefan Mecking
DOI:10.1021/jacs.8b03223
日期:2018.5.30
Due to their living characteristics in ethylene polymerization and the particularly low propensity of 5-Py for β-H elimination as reflected by a high linearity even at elevated polymerization temperatures of 60 °C, ultrahigh molecular weight polyethylene (UHMWPE) is formed in polar organic solvents (THF, diethyl ether) as a reaction medium in a controlled polymerization ( Mw/ Mn = 1.2 at Mn = 1.1 × 106
基于 2,4,8-三芳基萘胺的新型配合物 [[(2,4-3,5-(CF3)2C6H3}2-8-(3,5-R2C6H3)-C10H4)-N=C(H)- 3-(9-蒽基)-2-O-C6H3}-κ2-N,O]Ni(CH3)(吡啶)] (4-Py, R = Me; 5-Py, R = CF3) 合成自8-芳基萘胺,可通过选择性锂化、硼酸化和一锅法偶联生成。由于它们在乙烯聚合中的活性特性以及 5-Py 消除 β-H 的特别低的倾向,即使在 60 °C 的升高聚合温度下也表现出高线性,因此超高分子量聚乙烯 (UHMWPE) 在极性有机物中形成溶剂(THF、乙醚)作为受控聚合中的反应介质(Mw/Mn = 1.2,Mn = 1.1 × 106 g mol-1)。