6533b834fe1ef96bd129dfc8

RESEARCH PRODUCT

Non-linear effect of 18-crown-6 in propylene oxide polymerization with potassium glycidoxide used as the inimer

Andrzej StolarzewiczHolger FreyWojciech A. PisarskiZbigniew GrobelnyBarbara Morejko-buż

subject

chemistry.chemical_classificationPolymers and PlasticsChemistryOrganic ChemistryDispersityInorganic chemistry18-Crown-6EpoxideRing-opening polymerizationchemistry.chemical_compoundAnionic addition polymerizationstomatognathic systemPolymerizationPolymer chemistryMaterials ChemistryPropylene oxideCrown ether

description

A new initiating system containing potassium glycidoxide as the inimer and 18-crown-6 as the activator was used for propylene oxide polymerization. It was found that the rate of the reaction increased together with the crown ether concentration in a rather unexpected way. Two maxima of that parameter were found in the case of crown ether : inimer molar ratio equal to 3:1 and 6:1. On the other hand, the molecular weight of polymers showed two minima in those conditions. The heterogeneity of the reaction mixture and interactions between species present in the system could be responsible for the phenomena observed. The polydispersity of the polymers obtained was equal to about 1.2 and it was independent of the crown ether concentration.

yearjournalcountryeditionlanguage
2004-09-01Polymer
https://doi.org/10.1016/j.polymer.2004.07.073