INFLUENCE OF THE KIND OF CROWN-ETHER ON THE HETEROGENEOUS POLYMERIZATION OF PROPYLENE-OXIDE IN THE PRESENCE OF POTASSIUM HYDRIDE

Authors
STOLARZEWICZ A NEUGEBAUER D
Citation
A. Stolarzewicz et D. Neugebauer, INFLUENCE OF THE KIND OF CROWN-ETHER ON THE HETEROGENEOUS POLYMERIZATION OF PROPYLENE-OXIDE IN THE PRESENCE OF POTASSIUM HYDRIDE, Macromolecular chemistry and physics, 199(2), 1998, pp. 175-177
Citations number
12
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecular chemistry and physics → ACNP
ISSN journal
10221352
Volume
199
Issue
2
Year of publication
1998
Pages
175 - 177
Database
ISI
SICI code
1022-1352(1998)199:2<175:IOTKOC>2.0.ZU;2-G
Abstract
The influence of 12-crown-4, 15-crown-5, 18-crown-6, dicyclohexano-18- crown-6 and dicyclohexano-24-crown-8 on the propylene oxide polymeriza tion with potassium hydride was studied. The highest reaction rate was obtained in the presence of 18-crown-6 or dicyclohexano-18-crown-6. T he use of dicyclohexano-18-crown-6 was found to enhance the molecular mass of polymers more than other ligands. The observed effects were re lated to the heterogeneity of the reaction mixture and the structure o f the crown ether complexes with the potassium cation.