Production of polyether polyols using caesium as catalyst

An alternative catalyst to the traditional KOH was studied for preparation of polyols, having high molecular weight (about 6 000 g mol−1) and low unsaturation content. KOH catalyst is useful until the equivalent weight of the polyol reaches about 1 000 g mol−1, at which point an excess of allylic te...

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Bibliographic Details
Published in:Polymer international 2002-10, Vol.51 (10), p.1041-1046
Main Authors: de Lucas, Antonio, Rodríguez, Lourdes, Pérez-Collado, Mario, Sánchez, Paula
Format: Article
Language:English
Subjects:
Applied sciences
caesium
Exact sciences and technology
GPC
Organic polymers
Physicochemistry of polymers
Polymerization
polyols
Preparation, kinetics, thermodynamics, mechanism and catalysts
propylene oxide
synthesis
unsaturation
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Summary:An alternative catalyst to the traditional KOH was studied for preparation of polyols, having high molecular weight (about 6 000 g mol−1) and low unsaturation content. KOH catalyst is useful until the equivalent weight of the polyol reaches about 1 000 g mol−1, at which point an excess of allylic terminal unsaturation starts to develop. Polyols were synthesised using caesium and potassium hydroxide, at different temperatures and catalyst concentrations. Both the unsaturation content of the final polyol and the synthesis time decreased using caesium hydroxide instead of potassium hydroxide under the same synthesis conditions. The relationship to temperature and catalyst concentration was also studied. GPC analyses showed an additional small peak in the product, attributed to the allyl adduct, whose intensity was greater when potassium hydroxide was used as catalyst. © 2002 Society of Chemical Industry
ISSN:0959-8103
1097-0126
DOI:10.1002/pi.907