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. 2018 Nov 12;6:549. doi: 10.3389/fchem.2018.00549

Figure 3.

Figure 3

FT-IR spectra of (A) lignin powder, (B) pure SPEEK membrane, (C) SPEEK41/L15, (D) SPEEK50/L15, (E) SPEEK59/L15, (F) SPEEK72/L15.