Fig. 2 Mineralization and surface colonization of films of three PBAT [poly(butylene adipate-co-terephthalate)] variants during a 6-week soil incubation.

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Fig. 2 Mineralization and surface colonization of films of three PBAT [poly(butylene adipate-co-terephthalate)] variants during a 6-week soil incubation. Mineralization and surface colonization of films of three PBAT [poly(butylene adipate-co-terephthalate)] variants during a 6-week soil incubation. (A) Chemical structures of the tested PBAT variants, differing in the monomer unit that was 13C-labeled. PB*AT, P*BAT, and PBA*T contained 1,6-13C2-adipate, 13C4-butanediol, and 1-13C1-terephthalate, respectively. (B) Formation of 13CO2 from the three PBAT variants during their incubation in soil, monitored by 13C isotope-specific CO2 CRDS (cavity ring-down spectroscopy). PBAT variants were added to soils at time = 0 days. Results from replicate experiments performed with a slightly different setup are shown in fig. S1. (C) Representative SEM (scanning electron microscopy) images of a PBAT film after the 6-week soil incubation. The yellow rectangle in the left image defines the area shown at higher magnification in the right image. Scale bars, 50 μm (left) and 5 μm (right). Michael Thomas Zumstein et al. Sci Adv 2018;4:eaas9024 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).