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. 2021 Sep 9;11:18028. doi: 10.1038/s41598-021-97529-4

Figure 4.

Figure 4

SEM images of the cross-sectional surface of the LLDPE fibers with a melt flow index of 1.1, 10, and 20 according to the sulfonation time under a pressure of 1 bar, 5 bar and temperature of 130 °C (a) Sulfonated fiber under 1 bar pressure, (b) Sulfonated fiber under 5 bar pressure.