ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
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)
Sunday, November 28, 2021