明胶水溶液静电纺丝成形研究

以水为溶剂制备明胶溶液进行静电纺丝，在60 ℃～65 ℃纺得明胶超细纤维，探讨了溶液质量分数、静电电压及纤网收集距离等因素对明胶/水溶液体系静电纺丝成形的影响。结果表明，在60 ℃及65 ℃时，明胶溶液的黏度随其质量分数的增加而大幅上升，呈2次指数关系；随着明胶溶液质量分数的降低（从25%降到15%），所得纤维平均直径减少（从266.5 nm降为167.7 nm）；随着静电纺丝电压升高，纤维直径下降，当电压大于17 kV以后其变化趋于平缓；改变静电纺丝收集距离，从11 cm到21cm，电纺所得的纤维直径为165～210 nm，变化幅度不大。

Research on Electrospinning of Gelatin Aqueous Solution

Water is a good solvent for the gelatin nanofibers prepared by electrospinning process, but the spinning temperature must be maintained around 60 ℃ to 65 ℃. The viscosity of gelatin/water system influenced by the concentration of the solution is also an important factor for electrospinning. Based on the studied of electrospinning parameters on gelatin fibers’ morphology, it was found the viscosity of the gelatin solution increased with the concentration, and a kind of secondary exponential relationship was observed within the temperature range of 60 ℃~65 ℃. Mats with ultrafine gelatin fibers can also be prepared under the optimized electrospinning conditions, and the ultrafine fibers’ diameter changed from 167.7 nm to 266.5 nm when the concentration varied from 15 percent by weight to 25 percent. The opposite tendency was found with the increasing of spinning voltage, the diameter of the fibers reduced from 260 nm to 173 nm and then changed smoothly with the voltage increased from 13 kV to 17 kV. The distance of the spinning has little influence on the fiber diameters.