聚乙烯
聚合
聚合物
催化作用
材料科学
高分子化学
配位聚合
溶剂
化学工程
沉淀聚合
庚烷
共聚物
降水
过渡金属
热稳定性
甲苯
单体
溶液聚合
化学
有机化学
复合材料
自由基聚合
工程类
物理
气象学
作者
Wenbing Wang,Quan Wang,Chen Zou,Changle Chen
标识
DOI:10.1021/prechem.3c00103
摘要
Ultra-high-molecular-weight polyethylene (UHMWPE) plays an important role in many important fields as engineering plastics. In this contribution, a precipitation polymerization strategy is developed by combination of highly active phosphino-phenolate nickel catalysts with polymer-insoluble solvent (heptane) to access UHMWPE (Mn up to 8.3 × 106 g mol–1) with good product morphology, free-flowing characteristics, and great mechanical properties. Compared with the academically commonly used aromatic solvent (toluene), the utilization of heptane offers simultaneous enhancement in important parameters including activity, polymer molecular weight, and catalyst thermal stability. This system can also generate polar functionalized UHMWPE with molecular weight of up to 1.6 × 106 g mol–1 in the copolymerization of ethylene with polar comonomers. More importantly, this precipitation polymerization strategy is generally applicable to several representative transition metal catalyst systems, leading to UHMWPE synthesis with good product morphology control.
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