Cellulose fibers from cellulose/1-ethyl-3-methylimidazolium acetate solution were prepared by wet spinning with increasing extrusion speeds and draw ratios. The effects of spinning speeds on the structures and mechanical properties of these fibers were investigated by using scanning electron microscopy, wide angle X-ray diffraction, birefringence, thermogravimetric analysis, tensilefineness tester, and wet friction. The results showed that the crystallinity, orientation, and mechanical properties of the fibers were improved with increasing draw ratio. The break draw ratios, degrees of crystallinity and orientation, tenacities, and wet friction time of the cellulose fibers decreased with increasing extruding speeds. The wet friction time decreased with increasing draw ratio and decreased faster under higher extrusion speed. Due to the high dope concentration and the increased draw ratio, the maximum tenacity of the regenerated cellulose fibers reached 2.73 cN/dtex. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40225.
1-azido-2-hydroxypropyl cellulose ether, a novel potential energetic material, was prepared by reacting cellulose with glycidyl azide, which is synthesized from epihalohydrin via ring-opening and ring-closing reactions in the presence of diazoimide, under an alkaline condition, wherein a degree of substitution of the azido side chains as high as 0.5 and a nitrogen content of 10% (mass percentage) were achieved in the 1-azido-2-hydroxypropyl cellulose ether thus obtained. The structure and degree of substitution of the product were identified by characterizations such as elemental analysis, infrared absorption spectrum (IR), thermogravimetric analysis (TG), and nuclear magnetic resonance (NMR).
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