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Study of the quenching of triplet carbonyl groups and singlet oxygen by light stabilizers

P. Hrdlovič, J. Daněček, M. Karvaš, and J. Durmis

Polymer Institute, Slovak Academy of Sciences, 809 34 Bratislava

 

Abstract: The quenching constants of triplet carbonyl groups and singlet oxygen have been measured in model systems for nine light stabilizers of the type of organic ultraviolet absorbers and metal chelates as well as six acetylacetonates with bivalent and trivalent ions. Confrontation of the values of quenching constants has shown that organic ultraviolet absorbers are effective quenchers of triplet carbonyl groups and poor quenchers of singlet oxygen. Nickel(II) chelates are poor quenchers of triplet carbonyl groups and effective quenchers of singlet oxygen.  The feasibility of applying the results obtained with model systems to the photooxidation of polypropylene is discussed.

Full paper in Portable Document Format: 286a792.pdf

 

Chemical Papers 28 (6) 792–801 (1974)

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