Fig. 2

Surface condition and microstructure of PLM carriers upon varying times of degradation by A. niger. (a) Surface condition, (b–d) Adaxial surface microstructural characteristics of non-degraded, 14-day, and 28-day biodegraded samples, (e–g) Cross-sectional microstructural characteristics of non-degraded, 14-day, and 28-day biodegraded samples