Potassium hydroxide inhibition in poly(propylene oxide) autoxidation

A systematic study of the effect of potassium hydroxide on the autoxidation of poly(propylene oxide)s with number average molecular weights, M̄n, in the range 400–3000 has been made in the range of temperature 110–140°C. For all the polymers a considerable increase in the induction time was produced...

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Bibliographic Details
Published in:Die Makromolekulare Chemie 1977-02, Vol.178 (2), p.465-474
Main Authors: Griffiths, Peter J. F., Hughes, John G., Park, Geoffrey S.
Format: Article
Language:English
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Summary:A systematic study of the effect of potassium hydroxide on the autoxidation of poly(propylene oxide)s with number average molecular weights, M̄n, in the range 400–3000 has been made in the range of temperature 110–140°C. For all the polymers a considerable increase in the induction time was produced by KOH in solution in the polymer, the increase being most marked for the polymer of lowest molecular weight. For the polymers of molecular weight 1000 and lower, the rate of the subsequent autoxidation was considerably reduced by the KOH, the effect being greatest for the polymer of molecular weight 400. For polymers of molecular weight 2000 and above no change in rate was observed. The effectiveness of KOH as an antioxidant is shown to depend on the concentration of terminal hydroxyl groups and is explained by the non‐radical decomposition of RO −2 ions.
ISSN:0025-116X
0025-116X
DOI:10.1002/macp.1977.021780218