The photochemistry of 1-benzoyl-2-naphthol and 6-hydroxybenzanthrone and their effect on the rate of photo-oxidation of polypropylene

✍ Scribed by P. Bentley; J. F. McKellar

• Publisher: John Wiley and Sons
• Year: 1976
• Tongue: English
• Weight: 364 KB
• Volume: 20
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1976.070200501

✦ Synopsis

Abstract

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.