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. 2020 Apr 28;11:689. doi: 10.3389/fmicb.2020.00689

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Copyright © 2020 Falkenstein, Gräsing, Bielytskyi, Zimmermann, Matysik, Wei and Song.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Experimental setup for the UV irradiation of the PET powder sample. (B) ATR-FTIR spectra of the PET powder sample before (cyan) and after (red) UV treatment showing only the characteristic region from 2250 to 4000 cm^–1. (C) Proposed products obtained by UV irradiation of PET. (D) ¹H solution NMR spectra of untreated and UV-treated PET showing the relevant spectral regions from 3.8 to 4.8 ppm and 7.8 to 8.2 ppm. The relative integral ratios are given below the respective signals with the CH₂ signal at 4.01 ppm as the unit. Intensities of the HFIP signal (green) and the CH₂ signal (purple) are increased by a factor of 4 and 32, respectively. The ¹³C satellites of the parent HFIP signal are marked with asterisks.