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SEM images of (a) PBAT film with different carboxyl end group content (PBAT-26 and PBAT-10), PBAT film filled with carbon black (THH) and CaCO3 (THB) before and after a 75-day degradation; (b) PBS film with different molecular weight (PBS-27, PBS-15 and PBS-5) before and after a 75-day degradation. (c) Molecular structure of PBS and PBAT.
