基于循环流体动力纺丝法的水凝胶纤维的制备

Preparation of hydrogel fibers by circulating hydrodynamic spinning method

提出一种循环流体动力纺丝法,并设计、搭建了一套循环流体动力纺丝装置。以0.01 g/mL海藻酸钠溶液为纺丝原液、0.05 g/mL氯化钙溶液为凝固浴液,探究纺丝原液在凝固浴筒中的挤出位置对水凝胶纤维的形貌、直径及力学性能的影响。结果表明:挤出针头出口到凝固浴筒出口的距离在4.5~6.5 cm时,均能以0.9 m/s的速度收集到均匀、连续的水凝胶纤维;挤出针头出口到凝固浴筒出口的距离为4.5 cm时,得到的水凝胶纤维的平均直径最小,为65.67μm;挤出针头出口到凝固浴筒出口的距离为6.5 cm时,得到的水凝胶纤维的平均断裂强度和平均断裂伸长率最优,分别为1.1 cN/dtex和31.5%。该装置的放大和工艺参数的合理调控有望实现水凝胶纤维的连续化和高效化制备。

The circulating hydrodynamic spinning method was proposed and a set of circulating hydrodynamic spinning device was designed and built.Using 0.01 g/mL sodium alginate solution as the spinning original solution and 0.05 g/mL calcium chloride solution as the coagulation bath,the influence of extrusion position of the spinning original solution in the coagulation bath tube on the morphology,diameter and mechanical properties of the hydrogel fibers was investigated.The results showed that,uniform and continuous hydrogel fibers moving at a speed of 0.9 m/s could be collected,when the distance between the exit of the extrusion needle and the exit of the coagulation bath tube was 4.5-6.5 cm.When the distance between the exit of the extrusion needle and the exit of the coagulation bath tube was 4.5 cm,the average diameter of the hydrogel fibers was the smallest,65.67μm.When the distance between the exit of the extrusion needle and the exit of the coagulation bath tube was 6.5 cm,the average breaking strength and average elongation at break of the hydrogel fibers were the best,which were 1.1 cN/dtex and 31.5%,respectively.And it was expected that the continuous and efficient preparation of hydrogel fibers would be realized by amplifying the device and reasonable regulating the process parameters.