Abstract
In this study, the effect of electron beam (EB) and supercritical carbon dioxide (scCO2) treatments on the hydrophilicity of gray cotton pile fabric were investigated. The immersion time, an indicator of the hydrophilicity, was 19 s for a combination of the pre-EB irradiation and the post-scCO2 extraction. In contrast, the values were 13,750–13,990 s after EB irradiation and 65 s post-scCO2 treatment. The addition of a small amount of methanol or polyoxyethylene lauryl ether in scCO2 decreased the immersion time to 4 s or 2 s, which is the water wettability required for a towel product. ATR-FTIR analysis suggested the complete removal of waxy impurities from the gray cotton pile fabric by the combination treatment of EB and scCO2. It was also observed from the FE-SEM images that the visual structure of parallel ridges and grooves covering gray cotton fibers disappeared on fibers with a lower immersion time than 19 s, which suggested dewaxing (the removal of wax). The study reveals that EB irradiation and scCO2 are alternative waterless methods for improving the wettability of gray cotton fabrics.
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