Spunbond PET and PP nonwoven webs were treated by various plasma gases.The effects of plasma treatment on the dyeability were studied by colorimetry and DSC analysis.Surface characterizations such as optical microscopy,scanning electron microscopy,and Fourier transform infrared spectroscopy were conducted.The research results showed that the dyeability of PET and PP spunbond webs was significantly improved by plasma treatment. Functional groups were introduced onto the fiber surface and crystallinity was increased with the plasma treatment time. Functional groups played the predominant role in improving dyeability even though the increased crystallinity potentially reduced this improvement.It was concluded that (SO_2+O_2) plasma and (N_2+N_2+He) plasma could make the PET and PP spunbond nonwoven webs easily colored by conventional water-soluble acid dye,which is more environmentally friendly.
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