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- Title
Natural sunlight ageing of control and sterilized poly(ethylene terephthalate): Two-dimensional infrared correlation spectroscopic investigation.
- Authors
Al Lafi, Abdul G.; Abboudi, Maher; Aljoumaa, Khaled
- Abstract
ABSTRACT Attenuated total reflection Fourier transform infrared (ATR-FTIR) and two-dimensional correlation (2D-COS) spectroscopies were utilized to probe the structural changes occurring upon sunlight ageing up to 6 months in air atmosphere of both control and sterilized poly(ethylene terephthalate), (PET) bottles.Two dominant reactions were found; namely oxidation of the carbonyl groups and trans to gauche transformation of the ethylene glycole units. Oxidation manifested itself by the progressive development of a distinct band at 1690 cm−1assigned to the antisymmetric stretching of the carbonyl band in an aromatic carboxylic acid. Sterilizing the bottles by E-beam or Gamma rays prior to ageing reduced the correlation intensity of the band at 1690 cm−1, and led to the presence of higher molecular weight compounds such as terephthalic acid in stored water. The infrared spectroscopy combined with 2D-COS provides a powerful tool to investigate chemical and stero-chemical modification of polymers. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44736.
- Subjects
SUNSHINE; AGING; ETHYLENE crystals; OXIDATION; ALKENES
- Publication
Journal of Applied Polymer Science, 2017, Vol 134, Issue 17, pn/a
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.44736