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Triplet‐state quenching by photostabilizers of polyolefins
Author(s) -
Adamczyk A.,
Wilkinson F.
Publication year - 1974
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1974.070180420
Subject(s) - benzophenone , quenching (fluorescence) , triplet state , photodegradation , photochemistry , diradical , singlet state , singlet oxygen , materials science , diamagnetism , paramagnetism , benzene , nickel , chemistry , oxygen , excited state , molecule , organic chemistry , atomic physics , catalysis , physics , optics , photocatalysis , quantum mechanics , magnetic field , metallurgy , fluorescence
Paramagnetic nickel(II) complexes which are used as commercial photostabilizers of polyolefins are shown in laser photolysis studies to quench the triplet state of benzophenone in dilute benzene solution. The efficiency of quenching observed is less than that of diamagnetic square‐planar nickel(II) complexes which are more effective photostabilizers of polypropylene in “Xenotest” experiments. The observed rate constants for quenching of triplet benzophenone are compared with those observed by other workers for quenching of singlet oxygen, O 2 * ( 1 Δ g ), in dilute solution. The relevance of these studies to the understanding of photodegradation in polyolefins is discussed.