The Mechanism and Characteristics of Dry-jet Wet Spinning of Chitosan Fibers

Dry-jet Wet spinning에 의한 키토산 섬유의 형성기구 및 특성

A study has been made on the dry-jet wet spinning of chitosan fibers using 5% acetic acid as solvent and 5%, 10% aqueous sodium hydroxide as non-solvent. The technological characteristics of dry-jet wet spinning of chitosan fibers lie in the fact that small streams of dope extruded from the die are allowed to pass first through a short distance of air gap(0∼ 50 cm) before entering the spinning bath for full coagulation. This work showed the importances of air gap length and jet stretch ratio, and fiber tenacity up to 2.11% g/d could be obtained with elongation of 8∼13%. Deacetylation was readily achieved, and the extent of deacetylation was characterized by various techniques, including weight gain and elemental analysis. Individual fibers were evaluated on the basis of moisture content, swelling ratio, surface morphology, mechanical properties(tenacity, elongation, and work to rupture etc.), and fiber diameter. The fibers by this route were compared with those produced by wet spinning of chitosan.