Abstract
Three novel N-halamine antibacterial precursors are synthesized and characterized in this study. The monomers are attached onto cotton fibers through hydrolysis of oxyethyl groups to form silyl ether linkages with cellulose, followed by immersing the cotton fabrics into sodium hypochlorite solution to endow it with antibacterial property. The surface properties of the treated cotton are characterized via Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermal gravity analysis (TGA), and X-ray photoelectron spectroscopy (XPS) analysis. The antimicrobial cotton fabrics provide about 6–7 logs reduction against Gram-negative Escherichia coli O157:H7 (ATCC 43895) and Gram-positive Staphylococcus aureus (ATCC 6538) within contact times of 5–20 min. The breaking strength of the treated cotton fabrics decreases by about 16–18 % in the warp and 13–16 % in the weft. The silyl ether linkages are stable towards standard washing, and the oxidative chlorine show good storage stability, but with an ordinary washing fastness and poor UV resistance. Most of the lost chlorines could be regenerated via exposure to diluted household bleach.
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