Photo-oxidation of poly(diethylene glycol terephthalate)

Fiona J. Horne, John J. Liggat

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
14 Downloads (Pure)

Abstract

The photo-oxidation of poly(diethylene glycol terephthalate) (PDEGT) under accelerated aging conditions has been investigated. A weatherometer was used to expose samples to simulated sunlight under air, replicating outdoor exposure. Irradiations were also performed under air using UV lamps of wavelengths centred on 302 and 365 nm. After exposure, the extent of degradation was determined using attenuated total reflectance Fourier transform infrared spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy and UV–visible spectroscopy. Results show that in general PDEGT degrades to a greater extent than the closely-related polymer poly(ethylene terephthalate) due to the susceptibility of the ether linkage. Although the diethylene glycol sequences are not themselves photoactive over this wavelength range and are not acting as photochemical weak links they do serve as additional sites for secondary free radical chemistry.

Original languageEnglish
Article numbere53760
Number of pages15
JournalJournal of Applied Polymer Science
Volume140
Issue number16
Early online date24 Feb 2023
DOIs
Publication statusPublished - 20 Apr 2023

Keywords

  • photodegeneration
  • UV irradiation
  • weathering
  • FTIR

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