4-Metylmorpholine N-oxide/물 용액의 물 함량이 방사된 셀롤로오스 섬유의 물성에 미치는 영향

Abstract

The effects of water contents in the cellulose solutions and coagulants were investigated on the properties of the cellulose fibers. For the spinning, cellulose was dissolved in the 4-methylmorpholine N-oxide(MMNO)/water systems. The solutions of 6 wt% cellulose with MMNO/water solvents, containing of 9.9 to 17.8 wt % water, were extruded and coagulated at water/MMNO solutions. The fibers from the solution with the less amounts of water showed the less void porosities and the improved mechanical property. The cellulose solution, however, dissolved with 9.9 wt% water at the elevated temperature of 110˚C, resulted in the degradation of cellulose. Therefore, the solution with 13.8 wt % water was chosen to avoid the degration. The cellulose solution was spun into coagulants containing the various contents of water and MMNO. The porosities of the fibers were measured to be 0.1 to 2.5. As the MMNO concentrations in coagulants increased, the apparent void porosities significantly decreased, but the structure of fibers was shown to be homogeneous under SEM. The fiber spun at pure water coagulant has the dosely packed filaments with large macropore, while the fiber from coagulants containing MMNO showed the homogeneous distributions of relatively small sizes of voids. At a fixed draw ratio, the most homogenous structure and improved mechanical properties of cellulose fibers were obtained in the coagulants of 10-20 wt% MMNO.