LAUSR

In this work, using cotton pulps and urea as raw materials, cellulose carbamates (CCs) were successfully prepared by liquid-solid phase in the high-boiling aprotic and polar solvent (DMAc). Regenerated cellulose (RC) fibers were successfully spun from cellulose carbamate in a NaOH aqueous solution by wet spinning on a conventional viscose filament device. And the structures and properties of products were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), Thermal gravimetric analysis (TG) and Scanning electron microscopy (SEM), rheology measurement and dye testing. The results showed that the CC can be quickly dissolved in 9%NaOH solution. RC fibers exhibited a bright surface and an approximately circular cross section. There was no lobulate shape and contained obvious pores and voids in the internal sections. RC fibers demonstrated a typical cellulose II crystal structure and a good thermal stability. And tensile strength of the RC fibers was 1.4 cN/dtex, and their elongation at break was 6.8%. Furthermore, the RC fibers showed excellent dyeing properties compared with viscose rayon and Yingli Lyocell. So, the described carbamate pathway provided a simple and environmentally friendly method to overcome the environmental drawbacks of the traditional viscose process.