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. 2023 Jul 27;6:158. doi: 10.1038/s42004-023-00949-8

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Characterization of RPET feedstocks obtained from controlled depolymerization of PET with glycerol of varying amounts. a Differential scanning calorimetry temperature sweep of RPET compared to neat PET under a heating and cooling rate of 10 °C/min. Exothermic upwards. b Molecular weight distribution of RPET samples after gel permeation chromatography. The system was calibrated relative to polystyrene from 162 Da to 45.12 kDa. c Rheology results obtained for an isothermal oscillation at 1 Hz and 1% strain for 2 h. For all RPET samples, G’ (closed symbols) and G” (open symbols) changes were observed at 220 °C while for neat PET, G’ and G” changes were observed at its melting point of 260 °C. d Obtained grinded RPET 5:1, 5:3, and 1:1 powder feedstock.