静电纺丝热塑性聚氨酯纳米纤维的制备

将N，N-二甲基甲酰胺（DMF）和四氢呋喃（THF）按体积比0：4、1：3、2：2、3：1、4：0混合作为溶剂，确定配比后，在不同浓度、电压下对热塑性聚氨酯（TPU）溶液进行静电纺丝。结果表明，DMF与THF的体积比对聚氨酯静电纺丝纤维的形貌、直径及其均匀性有明显影响，当混合溶液体积比为2：2，浓度为0．18g／mL，电压为26kV时，TPU纺丝液纺丝效果最佳，得到最理想的纤维；纤维直径随DMF含量的增多而减小，但当DMF含量过多时，纤维上容易出现液滴，纤维形貌变差；TPU纺丝液浓度增大，纤维直径增大；电压增大，纤维直径减小。

Preparation of Thermoplastic Polyurethane Nanofiber by Electrospinning

Solvents of dimethylformadide（DMF） and tetrahydrofuran（THF） were mixed with volume proportion 0 ： 4,1 ： 3,2 ： 2,3 ： 1,4 ： 0. The solutions were electrospun under the different concentrations and different voltages after solvent ratio selected. The results showed that the proportional volume of DMF and THF had a significant impacted on morphology, diameter and uniformity of the electrospun nanofiers. When the proportional volume of DMF and THF was 2：2,tile concentration was 18 g/mL and the voltage was 26 kV, the most ideal nanofiber was obtained. Fiber diameter decreased with the increaseing of DMF content. However, when the DMF content increased to a certain degree, the droplets were appeared on fibers and the morphology of fiber became worse. The fiber diameter increased with the concentration increasing and decreased with the voltage increasing.