Preparation Of Carboxymethyl Cellulose-copper Ions Composite Fiber And Study On Its Antibacterial Property

Sodium carboxymethyl cellulose is one of the largest production, most versatile and the most convenient products in cellulose ethers, which is entitled "industrial monosodium glutamate". The signif icant property of CMC is that it can form a high viscosity colloidal solution, and it also contains lots of other properties such as thickening, flow, emulsifying dispersion, water retention, protective colloid, film forming, acid resistance, salt tolerance, and physiological harmless, thus it has wide range of applications in many fields of life. Based on the fact that CMC has a large number of the hydroxyl and carboxyl groups, the groups are reactive and can coordinate with metal ions, so it can be designed to form a three-dimensional network structure gel fiber using wet spinning method. With the r ise of the global industry, living standards have improved, so self-protection awareness are enhanced, and the quality of life tends to be harmless, environmental and healthy. Exploration and development of antibacterial fiber has drawn considerable attention due to important applications in various areas. At present, silver composite fiber and copper composite fiber dominates the research on antibacterial fiber.This article paid attention to the coordination interaction between metal ions and sodium carboxymethyl cellulose. Metal ions composite fibers were prepared using different substitution degree of carboxymethyl cellulose. And we also studied the fibers antibacterial properties.Although sodium carboxymethyl cellulose can coordinate with La3+、Ce3+ 、Fe3+、Cu2+ and some other high-priced metal ions to form gel, copper ions were chosen to make composite fiber with carboxymethyl cellulose, where copper chloride solution as coagulation bath. The spinnability of sodium carboxymethyl cellulose is the best when the concentration of the spinning solution is 3 %. The coagulation bath concentration, temperature and p H value has significant effect on the mechanical properties and the hygroscopicity of the fiber. The carboxymethyl cellulose-copper ions composite fiber is sensitive to humidity: when the temperature is constant, the higher the humidity, the weaker the mechanical properties and the larger the breaking elongation.Different degrees of substitution also have an effect on the mechanical and thermal property of the composite fibers. As the degree of substitution increases and break strength of the fiber will increase while the fiber breaking elongation decreases. Considering the cooperative effect of coordination interaction between copper ions and carboxyl groups and catalysis of copper ions on pyrolysis temperature of the composite fiber, the fibers are ranked from high to low: 0.7 degree of substitution f iber, 1.2 degree of substitution fiber, 0.9 degree of substitution fiber.The main driving force of gel fiber is the coordination interaction between carboxymethyl cellulose and metal ions. According to the FT-IR data, the coordination of Cu2+ and carboxylic acid groups is unidentate chelating ligand, and the mole ratio is 2:1.Carboxymethyl cellulose-copper ions composite fiber exhibited prominent antibacterial effect to staphylococcus aureu.