关键词: 1-乙基-3-甲基咪唑醋酸盐, 小间隙, 干湿纺, 纤维素, 取向

Abstract: Cellulose fibers were prepared from cellulose/1-ethyl-3-methylimidazolium acetate([EMIM]Ac) solution by dry-wet spinning with different small gaps and drawing speeds. Density gradient tubes, mercury porosimetry, wide angle X-ray diffraction(WAXD), birefringent, tensile-fineness tester and wet friction were utilized to characterize the structure and mechanical properties. The results showed that density gradient tubes and mercury porosimetry were accurate methods for testing of density and crystallinity of cellulose fibers. WAXD was suitable for relative comparison of crystallinity. Fibers tested were dense. Under small gap condition, increasing gap was in favor of the relaxation of internal stress of spinning solution, properly increasing drawing speed was in favor of the orientation and crystallinity of fibers, which led to better mechanical properties of fibers.

Key words: 1-ethyl-3-methylimidazolium acetate, small , gap, dry-wet spinning, cellulose, orientation