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X‐ray photoelectron spectroscopy study on the photodegradation of copolyester model compounds
Author(s) -
Arangdad Kiarash,
Yildirim Erol,
Detwiler Andrew,
Cleven Curtis D.,
Burk Christopher,
Shamey Renzo,
Pasquinelli Melissa A.,
Freeman Harold,
ElShafei Ahmed
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49661
Subject(s) - x ray photoelectron spectroscopy , photodegradation , terephthalic acid , irradiation , reactivity (psychology) , materials science , spectral line , copolyester , analytical chemistry (journal) , photochemistry , chemistry , organic chemistry , photocatalysis , polyester , nuclear magnetic resonance , catalysis , medicine , physics , alternative medicine , pathology , astronomy , nuclear physics
The photodegradation of irradiated PETG and PCCT model compounds namely Tm‐CHDM‐Tm and Tm‐TMCD‐Tm, where Tm refers to the methyl ester of terephthalic acid, CHDM refers to 1, 4‐cyclohexanedimethanol, and TMCD refers to tetramethyl‐1, 3‐cyclobutanediol, was analyzed using X‐ray photoelectron spectroscopy. Photodegradation products were characterized based on high resolution O 1s x‐ray photoelectron spectroscopy (XPS) spectra and the spectra of irradiated model compounds showed a decrease in the relative intensity of CO compared to the CO peak. The percentage of CO formation in irradiated model compounds changed in proportion to irradiation time and showed that the model compound containing CHDM was slightly more UV stable than the TMCD based model compound. Photodegradation mechanisms for model compounds were proposed based on XPS spectra. In parallel studies, density functional theory calculations were performed as an approach to predict degradation products, to help interpreting the XPS spectra of model compounds and characterize the reactivity of model compounds.