Accession Number:

AD0784486

Title:

The Mechanism of Photoprotection of Polystyrene Film by Some Ultraviolet Absorbers,

Descriptive Note:

Corporate Author:

DEFENCE STANDARDS LABS MARIBYRNONG (AUSTRALIA)

Personal Author(s):

Report Date:

1973-06-05

Pagination or Media Count:

9.0

Abstract:

The efficiency of three commercial ultraviolet absorbers, a 2-hydroxy benzophenone, a 2-hydroxy benzotriazole, and a nickel chelate, in preventing the photo-oxidation of polystyrene films has been measured. When compared with the calculated screening and phosphorescence quenching efficiency, it is found that i the nickel chelate protects the substrate by UV screening alone and is a poor photoprotector, and ii the 2-hydroxy benzophenone and 2-hydroxy benzotriazole are more efficient photoprotectors and protect by triplet energy transfer from excited polymer carbonyl impurity groups in addition to UV screening. Author

Subject Categories:

  • Radiation and Nuclear Chemistry
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE