天然彩色棉纤维素LiCl/DMAc溶液流变性能的研究

为进行天然彩色棉纤维素的静电纺丝，研究了天然彩色棉和白棉纤维素LiCl/DMAc（N,N-二甲基乙酰胺）溶液的流变性能。结果表明：棕棉纤维素LiCl/DMAc溶液的非牛顿指数较高，最接近1；3种纤维素溶液的非牛顿指数随溶液温度的升高而增高，棕棉、绿棉纤维素LiCl/DMAc溶液分别在30、35℃以上具有较稳定的流变特性；3种纤维素溶液的非牛顿指数随溶液质量分数的增加而减小，棕棉、绿棉纤维素溶液质量分数在1.2%、1.1%以下均具有较稳定的非牛顿指数。通过棕棉纤维素LiCl/DMAc溶液的静电纺丝实验，证实了棕棉纤维素质量分数必须在1.2%以下才可能形成稳定的射流，制得直径为200nm以下的静纺纤维。

Study on rheological properties of naturally colored cotton fiber/LiCl/DMAc solution

For electrospinning of naturally colored cotton cellulose, rheological properties of LiCl/DMAc(Dimethyl acetamide) solutions with naturally colored cotton fibers, including the green and brown, and white cotton desolved have been investigated respectively. The experimental results showed that Non-Newtonian index of the brown cotton / LiCl/DMAc solution is the highest, closest to 1, and the Non-Newtonian indexes of all three fiber / LiCl/DMAc solutions increase with the increase of solution temperature and decrease with the increase of mass concentration. The rheological property remains relatively stable when the solution temperature is above 30℃ for the brown, and above 35℃ for the green. When the mass concentration is below 1.2% for the brown and 1.1% for the green, the solutions have stable Non-Newtonian index. The electrospinning experiment of the brown cotton demonstrated that a stable jet can be formed only when the mass concentration is below 1.2%，and electrospun nanofibers of a diameter less than 200nm can be obtained.