First in-Situ Observation of Pseudoliving Character and Active Site of Nd-Based Catalyst for 1,3-Butadiene Polymerization Using Synchrotron X-ray Absorption and UV-Visible Spectroscopies

摘要

The imporance of living polymerization and high stereoregularity in industry has developed lanthanide-based catalysts. Among Ziegler-Natta catalysts currently being used in the rubber industry for the high cis 1,4-polymerization of 1,3-butadiene, the Nd-based catalyst (Nd(carboxylate)_3/AlEt_2Cl/Al(~iBu)_3 is of particular interest because it gives a cis microstructure (up to 99%) higher than any other catalysts and has pseudoliving character that is very rare in Ziegler-Natta catalysts. In the course of understanding the pseudoliving character and the active site around neodymium, in-situ spectroscopic observation on the active site was conducted using synchrotron X-ray absorption and UV-vis spectroscopies.