Study On Chitosan Derivative Fibers

Chitosan fiber possesses properties of security, antibacterial and non-toxic, etc. It can be used for surgical sutures, medical dressings and artificial skin in the medical field, and made into antibacterial and health textiles in textile industry. Its application and economic value is reflected day by day, and it was regarded as the new type of green fiber in the21st century. Chitosan derivatives with better properties are prepared by modification reaction of acylation, etherification and alkylation, etc. Chitosan derivative fiber has aroused the world scholars’ attention in recent year. With high antibacterial, water absorption and strength properties of chitosan derivative fiber which was made of derivatives can made up the defects of with hygroscopicity poor and low strength of chitosan fibers. It will broaden the application field of chitosan, and improves the economic value and social benefits of chitosan. Therefore the research of chitosan derivative fiber has great significance.This paper mainly conducts two parts of research works in order to prepare chitosan derivative fiber which was prepared by modification reaction with excellent mechanical properties.Part one is:carboxymethyl chitosan was prepared from chloroactic acid and chitosan which were raw materials by etherification modification. Fourier infrared spectroscopic analysis and X-ray diffraction results showed that etherification reaction was successly proceed on amino and hydroxyl of chitosan chain. Carboxymethyl chitosan was made into fibers through the wet spinning. The obtained fiber was treated by crosslinking reaction to get good mechanical properties of carboxymethyl chitosan fibers. Thermal gravimetric analysis and scanning electron microscope analysis results showed that carboxymethyl chitosan fiber had good thermal properties and surface morphology. Carboxymethyl chitosan fiber with breaking strength0.612cN/dtex and water absorption rate12.34g/g was prepared under the conditions which of the substitution degree of carboxymethyl chitosan was40.20%, carboxymethyl chitosan amount was40%that relative to2%volume fraction of acetic acid, methanol was coagulation bath, and the coagulation time was14minutes. The breaking strength of carboxymethyl chitosan fiber was up to1.897cN/dtex after crosslinking processing.Part two is:chitosan/PVA blend fiber which blended with different proportions was prepared by wet spinning in coagulation bath of9%NaOH aqueous solution and alcohol. It had good mechanical properties and water absorption rate. Fourier infrared spectroscopic and SEM analysis results showed that there had good compatibility between chitosan and PVA in blend fiber.4%mass fraction chitosan solution and10%mass fraction PVA aqueous solution were blend and made into chitosan/PVA blend fiber. The best breaking strength of chitosan/PVA blend fiber was0.821cN/dtex when volume ratio of was7:3. The best water absorption rate of chitosan/PVA blend fiber was2.42g/g when volume ratio of was5:5. The breaking strength of crosslinking chitosan/PVA blend fibers with glutaraldehyde was2.128cN/dtex when7%volume fraction of glutaraldehyde and blend fibers which blended with volume ratio of7:3were proceed by crosslinking treatment at55centigrade and the reaction time was40minute. Thermal gravimetric analysis showed that chitosan/PVA blending fiber and crosslinking chitosan/PVA blend fibers with glutaraldehyde had good thermal performance.