As shown in Table 2, the relative c

As shown in Table 2, the relative content of Na gradually increased withincreasing current density. The contamination possibly penetrated intothe interior of the fiber during the oiling treatment. In the process ofelectrochemical oxidation, the internal higher content of Na could bedetected with the removal of outer weak boundary layer [8]. The relative content of carbon element on the surfaces of untreated UHMCFswas as high as 97.47%, and the atomic ratio (O/C) of untreated UHMCFsurfaces was merely 0.019, which proved that untreated UHMCFs hadhighly inert surfaces