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A. Chruściel, W. Hreczuch, K. Czaja, K. Ławniczak-Jabłońska, J. Janik

The complementary structural studies of the double metal cyanide type catalysts
for the ring opening polymerization of the oxiranes (in English)

Polimery 2016, No 6, 421


DOI: dx.doi.org/10.14314/polimery.2016.421

Summary

The extensive complementary experimental studies of the double metal catalysts (DMC) with two kinds of the organic ligands were performed. The chemical justification of the observed TG/DSC (thermogravimetric analysis/differential scanning calorimetry) steps was proposed. Several organic ligand complexing states were found in both types of catalysts. X-ray absorption spectroscopy (XAS) analysis established that only Zn atoms are the active metallic centers in DMC catalyst regardless the used ligand. Cl atoms were detected near some of Zn atoms. Contrary to the common suppositions no significant amount of oxygen atoms was detected in the closest coordination spheres of Zn.
Keywords: double metal cyanide catalysts (DMC), thermal analysis, thermogravimetric analysis (TG), differential scanning calorimetry (DSC), evolved gas analysis (EGA), X-ray absorption spectroscopy (XAS), X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS)
e-mail: arkach@mexeo.pl
A. Chruściel, W. Hreczuch, K. Czaja, K. Ławniczak-Jabłońska, J. Janik (1.18 MB)
The complementary structural studies of the double metal cyanide type catalysts for the ring opening polymerization of the oxiranes (in English)