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 dissolved have been investigated respectively.The experimental results showed that Non-Newtonian index of the brown cotton /LiCl /DMAc solution is the highest,close 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 200 nm can be obtained.