脂肪族聚碳酸酯聚氨酯的静电纺丝

以不同体积比的二甲基甲酰胺（DMF）和四氢呋喃（THF）为混合溶剂用于生物材料聚碳酸酯聚氨酯的静电纺丝，扫描电镜结果发现，当DMF在混合溶剂中所占的体积分数高于75％时，容易形成珠丝结构薄膜；而当DMF体积分数为50％时，可得到无珠丝的均匀纤维结构薄膜＇-3静电电压介于15～20kV时，所得纤维直径大于1000nm；而当电压介于20-32kV时，形成的纤维直径在420—720nm之间，纤维分布较为均匀．聚碳酸酯聚氨酯溶液的质量分数低于10％时，易形成珠丝结构，而提高其浓度，珠丝现象消失．当聚碳酸酯聚氨酯质量分数大于12％时，所得纤维平均直径较大（1840nm）．溶液体积流率对纤维直径的影响呈线性正比关系，所考察的最小体积流率为0.3mL／h，可得到均匀纤维，其平均直径为420nm．

Electrospinning of Aliphatic Polycarbonate Urethane

DMF and THF mixture with different volume ratios was used as a mixed solvent for electrospinning of biomaterial polycarbonate urethane （PCU）. SEM results showed that bead-fiber structure membranes were obtained when the DMF volume ratio in the mixed solvent was above 75%. When DMF was 50% in the mixed solvent it was easy to obtain uniformed micro-structure fibers without beads. When the voltage ranged from 15 kV to 20 kV, the average fiber diameters were more than 1 000 nm, whereas the average diameters showed uniformed nano-structure ranging from 420 nm to 720 nm when the voltage increased from 20 kV to 32 kV. When PCU mass concentration was less than 10%, bead-fiber membranes were obtained. However, the bead-fibers disappeared in the membranes when PCU mass concentration increased. When PCU mass concentration was 12%, the average fiber diameter was high with the value of 1 840 nm. A proportional relationship between the average fiber diameter and the volume flow rate was found. When the volume flow rate of PCU solution was 0.3 mL/h, the average fiber diameter was found to be 420 nm.