周期性变电场下熔体静电纺丝射流的介观模拟

利用介观模拟的耗散粒子动力学法, 对纺丝射流稳定直线段区域进行变电场模拟, 并以三维的射流路径呈现出来. 研究了不同控制频率下的变电场对聚合物分子链的运动情况、 射流直径及下落行为的影响. 结果表明, 与稳定电场相比, 周期性改变电场能够有效提高分子链的拉伸, 使射流直径减小, 较低的控制频率能够加速射流的下落, 从而获得较细的纤维.

Mesoscale Simulation of a Melt Electrospinning Jet in a Periodically Changing Electric Field

Significant polymer chain entanglement in melt electrospinning severely impedes efforts to produce nanoscale fibers.To reduce this entanglement and improve our understanding of the motion of molecular chains, a periodically changing electric field, in which the wave is the absolute value of a sine function, was introduced in a melt electrospinning simulation system to replace the typical stable electric field.The three-dimensional path of the jet in a small straight region in the changing electric field was simulated using a dissipative particle dynamics mesoscale simulation method.The movement of the polymer chains, effect on jet diameter, and changes in the jet falling behavior at different control frequencies of the changing electric field were studied.The results show that the periodically changing electric field could increase stretching of the polymer chains and reduce the diameter of the jet effectively compared to a stable electric field.For the changing electric field, a low control frequency accelerated the falling velocity, suitable for obtaining thin fibers.