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Control of polymer topology by chain-walking catalysts

机译:通过链走催化剂控制聚合物拓扑

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Chain-walking catalysts are demonstrated to control the branching topology of polyethylene by tuning the competition between monomer insertion and chain isomerization (walking). The topology of the polyethylene was controlled from linear with moderate branching to hyperbranched to dendritic. Although overall branching number and distribution of short chain branching are relatively constant, the topology of the polyethylene changes from linear polyethylene with moderate branches at high ethylene pressures to a dendritic polyethylene at low pressures. This provides a straightforward one-pot process for making polymers with a full range of tunable topologies. [References: 75]
机译:已证明链行走催化剂可通过调节单体插入和链异构化(行走)之间的竞争来控制聚乙烯的支链拓扑。聚乙烯的拓扑结构从具有中等支化度的线性到超支化再到树状。尽管总的支化数和短链支化的分布是相对恒定的,但是聚乙烯的拓扑结构从在高乙烯压力下具有中等支化度的线性聚乙烯变为在低压下的树枝状聚乙烯。这提供了一种简单的一锅法工艺,用于制造具有各种可调拓扑的聚合物。 [参考:75]

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