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. 2020 Mar 9;15(3):e0229962. doi: 10.1371/journal.pone.0229962

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© 2020 Hu et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 1 — Column A pertains to green PES MFs while column B is transparent PP MFs. μ-FT-IR characterized and confirmed polymers in each MF type (A₁ and B₁). Brightfield images are shown in A₂ and B₂. Surface structure imaged with SEM is in A₃ and B₃. Size distributions show PES fibers averaged 350 μm in length (A₄) and PP averaged 380 μm long (B₄).