Polyethylene as a Cosolvent and Catalyst Support in Ring-Opening Metathesis Polymerization
作者:Jakkrit Suriboot、Christopher E. Hobbs、William Guzman、Hassan S. Bazzi、David E. Bergbreiter
DOI:10.1021/acs.macromol.5b01141
日期:2015.8.25
Polyethylene oligomers (PEOlig) can be used as cosolvents and sometimes soluble catalyst supports in ring-opening metathesis polymerization (ROMP) reactions. As a catalyst support, this polyolefin serves as an N-heterocyclic carbene ligand for a ROMP catalyst, making it soluble at 70 °C and insoluble at room temperature. As a cosolvent, unfunctionalized PE oligomers facilitate quantitative separation of PEOlig-bound
聚乙烯低聚物(PE Olig)可以用作助溶剂,有时在开环复分解聚合(ROMP)反应中可溶的催化剂载体。作为催化剂载体,该聚烯烃用作ROMP催化剂的N杂环卡宾配体,使其在70°C时可溶,在室温下不溶。作为助溶剂,未官能化的PE低聚物有助于从聚合物产物中定量分离PE Olig结合的Ru催化剂残留物。在这些情况下,未官能化的聚乙烯(Polywax)的不溶性及其对PE Olig的截留在室温下,在产物相中负载的Ru残留物可使ROMP产品的Ru污染度低于使用可溶性催化剂的其他程序。这些分离只需要物理过程即可分离出产物和催化剂残留物,而无需其他溶剂。对照实验表明,观察到的大部分(约90%)Ru浸出是由于在乙烯基醚淬灭步骤中形成的Ru副产物,而不是由涉及PE Olig负载的Ru络合物的聚合过程引起的。