Aim at developing high-performance wound dressing with super moisture control performance, excellent antimicrobial activity, good biocompatibility as well as reduced cost, carboxymethyl rayon viscose yarns (CM-RVYs) had been successfully prepared by alkalinization and etherification of rayon viscose yarns using sodium hydroxide and chloroacetic acid. The antibacterial CM-RVYs were obtained by uniting chitosan/nano-Ag to the CM-RVYs through electrostatic interaction of the polyelectrolyte. The FTIR and XRD analysis showed that the rayon viscose yarns underwent different degrees of carboxymethylation with the change of the degree of substitution (DS). The change of DS could affect the water absorption, water retention, mechanical properties and antimicrobial properties of CM-RVYs, which in turn could determine their performance as antimicrobial and moisture control dressing. The research results indicated that with the increasing DS, crystallinity degree of CM-RVYs decreased gradually. The surface and cross section of modified rayon viscose yarns became rough and irregular along with various white crystal-like protuberances appeared on its surface. And water absorption and water retention of CM-RVYs both rose a lot, but its breaking strength first increased then decreased compared with breaking elongation fluctuated just between 16%. With DS of 0.51, the water absorption of CM-RVYs reached 13.01 g·g^-1 and its breaking strength and breaking elongation were respectively at 8.54 cN and 15.27%. And chitosan/nano-Ag modified CM-RVYs showed good antibacterial properties against E. coli and S. aureus which would be used as high performance antibacterial and moisture control dressing.

This paper reports a method for preparing artificial leather with high comfort and useful mechanical property. Blending thermoplastic polyurethane elastomer (TPU), Toluene diisocyanate (TDI) polyurethane prepolymer and 4,4-Methylene bis(2-chloroaniline) (MOCA), and a nanofiber artificial leather was obtained by using online reactive electrospinning technology and heat cross-linking. Compared with the commercial PU artificial leather, the tensile strength of nanofiber artificial leather from 3.2 MPa to 11.2 MPa, and the air permeability of nanofiber artificial leather from 0.25 to 2.974 mm/s, and the moisture permeability of nanofiber artificial leather from 981 to 4615 g/m².24h. The NCO groups on the TPU and TDI prepolymer molecules, and the NH₂ groups on the MOCA cross-linking agent were polymerized by heat treatment, and a cohesive structure was formed between fibers, which significantly improve the mechanical property of nanofiber artificial leather. It was close to sheep leather in mechanical property, and it was air permeability and moisture permeability were much higher than those of sheep leather and commercial PU artificial leather. The nanofiber artificial leather prepared in this study has excellent prospects for application in the fields of luggage, footwear, and clothing.