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The photochemistry of 1‐benzoyl‐2‐naphthol and 6‐hydroxybenzanthrone and their effect on the rate of photo‐oxidation of polypropylene
Author(s) -
Bentley P.,
McKellar J. F.
Publication year - 1976
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.1976.070200501
Subject(s) - photochemistry , polypropylene , chemistry , singlet state , molecule , polymer chemistry , materials science , organic chemistry , excited state , physics , nuclear physics
A comparison of the effect of two structurally similar additives, 1‐benzoyl‐2‐naphthol and 6‐hydroxybenzanthrone, on the rate of photo‐oxidation of polypropylene under conditions of simulated daylight shows that while 6‐hydroxybenzanthrone acts as a prodegradant, 1‐benzoyl‐2‐naphthol is a light stabilizer. Examination of the spectroscopic and photochemical properties of 1‐benzoyl‐2‐naphthol indicates that in fluid solution the photoexcited stabilizer is probably deactivated within the singlet manifold. In glassy solvents at 77°K, on the other hand, triplet formation does occur, but only in molecules in which the intermolecular hydrogen bond of the 1‐benzoyl‐2‐naphthol is disrupted.