Study On The Surface Modification Of Viscose Fibers

With the improvement of people's living,functional and eco-friendly textile materials are given more and more emphasis.As is well known,the surface properties of textile materials are more important than their bulk properties,a number of attempts of surface grafting-modification of fibers have been made to change their surface chemical composition and structure to improve their properties.As a class of natural cellulose fibers,viscose fibers have been widely used as textile materials because of their good softness,perfect moisture absorption and the affinity for body.In this paper,the surface modification technologies were investigated to improve the strength of viscose fibers and prepare functional viscose fibers.After viscose fibers were modified,a functional layer was formed on the surface of viscoae fibers,the wet strength of fibers was improved and the antibacterial viscose fibers were prepared.At the meantime,the mechanism of modification was discussed by analyzing their structure and properties.Cellulose fibers were chemically modified on surface by KMnO₄ premodification and acrylamide polymerization.After viscose fibers were pre-treated by KMnO₄,KMnO₄ was absorbed onto the surface of fibers, resulting in the formation of surface radicals and the subsequent,initiatiion of the grafting polymerization of acrylamide.On the other hand,acrylamide was also grafted onto the surface of viscose fibers by reaction with aldehyde and carboxyl group formed by KMnO₄ oxidation of the surface of fibers.The modified viscose fibers had different surface morphology,chemical structure, microstructure and thermal property from parent fibers,improved crystallity structure and good wet strength,1.25cN/dtex,4.2%higher than parent fibers.At the meantime,giving the antibacterial ratio was kept up to above 90%against S. aureus.The inorganic antibacterial agent was prepared by adsorption using nano-SiO₂ as carrier and silver nitrate as Ag source.The study clearly demonstrats that antibacterial agent had excellent broad-spectrum antibiosis property,giving the antibacterial ratio up to above 90%against E.coli and S. aureus.The antibacterial agent was used to prepare antibacterial viscose fibers. The antibacterial layer was formed by covalent bonding between antibacterial agent and viscose fibers through acrylamide as coupling laryer.The antibacterial viscose fibers showed excellent antibacterial performance and wash-resistant property.In other words,the antibacterial rate was higher than 80%after 30 times of repeated wash.To further improve the wet strength,glutaraldehyde was used for the formation of net structure in the crosslinking reaction process with polyacrylamide.The crossliked viscose fibers had improved wet strength,with the maxinum value being 1.41cN/dtex,17.5%higher than parent fibers.