Electrospinning of polyurethane solution based on tetrahydrofuran/N,N-dimethyl formamide

Solvents of tetrahydrofuran(THF) and dimethylformadide(DMF) were mixed with mass proportion of 3∶7,4∶6,5∶5,6∶4,7∶3 respectively,and then polyurethane was dissolved in the mixed solvents.The resulting solutions were electrospun into nanofibers under conditions of different mass concentrations,voltages,and distance between nozzle and the bat.The results show that m(THF)∶m(DMF) has great effect on morphology,diameter and uniformity of the spun fibers.The uniformity decreases with the increase of THF.The fiber diameter increases with the increase of mass concentration,and the uniformity descends as a whole.The effect of voltage and receiving distance on the fiber diameter exhibit no regular rules.The electrospun fibers obtained in this study have the average diameter of(230 nm),uniformity coefficient of 0.23 and ideal morphology.