The variation in the oxidation state of the titanium species after reaction with various alkylaluminiums was investigated by X-ray photoelectron spectroscopy (XPS). The reaction of an MgCl 2-supported Ziegler catalyst with alkylaluminium was observed to induce a chemical shift to lower binding energy and a broadening of the full width at half maximum intensity (FWHM), depending upon the kind of alkylaluminium. The polymerization kinetics was examined for slurry and stopped-flow polymerization to estimate the relationship between polymerization stages. The catalyst activation and the decay during the polymerization were found to be related to the variation in the titanium species arising from various alkylaluminium compounds.
Посилання на статтю:
Variation in oxidation state of titanium species on MgCl 2-supported Ziegler catalyst and its correlation with kinetic behavior for propylene polymerization / Hideharu Mori, Koichi Hasebe, Minoru Terano // Polymer. – 1999. – N 40. – P. 1389–1394.