New photostabilizers for polystyrene based on 2,3-dihydro-(5-mercapto-1,3,4-oxadiazol-2-yl)- phenyl-2-(substituted)-1,3,4-oxazepine- 4,7-dione compounds

Emad Yousif, Ayad Hameed, Nadia Salih, Jumat Salimon, Bashar Mudhaffar Abdullah

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The photostabilization of polystyrene (PS) films by 2,3-dihydro-(5-mercapto-1,3,4-oxadiazol-2-yl)-phenyl-2- (substituted)-1,3,4-oxazepine-4,7-dione compounds was investigated. PS films containing concentration of complexes 0.5% by weight were produced by the casting method from chloroform as a solvent. The photostabilization activities of these compounds were determined by monitoring the carbonyl and hydroxyl indices with irradiation time. The changes in viscosity average molecular weight of PS with irradiation time were also tracked (using benzene as a solvent). The quantum yield of the chain scission (Φcs) of these complexes in PS films was evaluated and found to range between 3.31 × 10-6 and 7.89 × 10-6. Results obtained showed that the rate of photostabilization of PS in the presence of the additive follows the trend (I > II > III > IV). According to the experimental results obtained, several mechanisms were suggested depending on the structure of the additive like UV absorption, peroxide decomposer and radical scavenger.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalSpringerPlus
Volume2
Issue number1
DOIs
Publication statusPublished - 2013

Fingerprint

Oxazepines
Polystyrenes
Irradiation
Peroxides
Quantum yield
Chloroform
Benzene
Hydroxyl Radical
Casting
Molecular weight
Viscosity
Monitoring

Keywords

  • 1,3,4-oxadiazole
  • 1,3-Oxazepine
  • Photochemistry
  • Photostabilizer
  • PS
  • UV Absorber
  • UV-vis Spectroscopy

ASJC Scopus subject areas

  • General

Cite this

New photostabilizers for polystyrene based on 2,3-dihydro-(5-mercapto-1,3,4-oxadiazol-2-yl)- phenyl-2-(substituted)-1,3,4-oxazepine- 4,7-dione compounds. / Yousif, Emad; Hameed, Ayad; Salih, Nadia; Salimon, Jumat; Abdullah, Bashar Mudhaffar.

In: SpringerPlus, Vol. 2, No. 1, 2013, p. 1-8.

Research output: Contribution to journalArticle

Yousif, Emad ; Hameed, Ayad ; Salih, Nadia ; Salimon, Jumat ; Abdullah, Bashar Mudhaffar. / New photostabilizers for polystyrene based on 2,3-dihydro-(5-mercapto-1,3,4-oxadiazol-2-yl)- phenyl-2-(substituted)-1,3,4-oxazepine- 4,7-dione compounds. In: SpringerPlus. 2013 ; Vol. 2, No. 1. pp. 1-8.
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