Regenerated cellulose microspheres were prepared by means of electrospraying technology from environmental-friendly NaOH/urea aqueous system.The effects of processing parameters including surface tension

electrostatic force

solution viscosity and flow rate on the morphology and size of cellulose microspheres were investigated.The properties of microspheres were characterized by SEM

FTIR and XRD.The results indicate that microspheres with small particle size were prepared from cellulose solutions with low value of surface tension.The particle size is related to the homogeneity of solution and the volatility of solvent system.There is an obvious decrease in the particle size with an increase in the electrostatic force

while the particle size increases with increasing flow rate.The shape of microspheres depends on solution viscosity significantly.With decreasing solution viscosity

the shape of particles may change from sphere to wedge and even strip.Meanwhile

the particle size decreases and size distribution increases.In addition

the regenerated cellulose microspheres have good porosity.The molecular structure of cellulose remains but the crystal structure changes from cellulose I into cellulose Ⅱ in the process of dissolving and regenerating.