Premium
Influence of the kind of crown ether on the heterogeneous polymerization of propylene oxide in the presence of potassium hydride
Author(s) -
Stolarzewicz Andrzej,
Neugebauer Dorota
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980201)199:2<175::aid-macp175>3.0.co;2-9
Subject(s) - propylene oxide , chemistry , crown ether , potassium , polymerization , polymer chemistry , crown (dentistry) , hydride , ether , inorganic chemistry , polymer , oxide , ethylene oxide , organic chemistry , materials science , ion , metal , copolymer , composite material
The influence of 12‐crown‐4, 15‐crown‐5, 18‐crown‐6, dicyclohexano‐18‐crown‐6 and dicyclohexano‐24‐crown‐6 on the propylene oxide polymerization with potassium hydride was studied. The highest reaction rate was obtained in the presence of 18‐crown‐6 or dicyclohexano‐18‐crown‐6. The use of dicyclohexano‐18‐crown‐6 was found to enhance the molecular mass of polymers more than other ligands. The observed effects were related to the heterogeneity of the reaction mixture and the structure of the crown ether complexes with the potassium cation.