熔体静电纺丝纤维下落过程的DPD探索模拟

DPD simulation of fiber falling in melt electrospinning

静电纺丝是目前唯一能够直接、连续制备聚合物纳米纤维的方法,为了深入了解熔体静电纺丝纤维下落过程中的变化情况,探索用耗散粒子动力学介观模拟方法创建了静电纺丝模拟体系,模拟出聚合物黏度对不同阶段纤维下落速度的影响,发现纤维下落速度增加到一个最大值时,又逐渐变小;还模拟了聚合物不同链长时纺丝纤维的下落形貌,发现随着链长增加,纤维下落速度逐渐减慢;最后研究了弹簧系数对下落过程中聚合物均方末端距的影响,均方末端距增加到一个最大值时,又逐渐变小。从介观模拟的角度对熔体静电纺丝纤维下落过程进行了模拟探索,对这一物理现象中的科学问题得到了更深层次的理解。

Electrospinning has attracted much attention recently as a direct and consecutive fabrication technique for producing nano-scale to micro-scale fibers.In order to achieve deeper understanding of fiber change in the electrospinning process,this paper explores the mesoscopic simulation method of dissipative particle dynamics to create the electrospinning simulation system.The effect of viscosity on fiber falling velocity in different stages,the effect of chain length on fiber falling morphology and the effect of spring coefficient on end to end distance of polymer chains were successfully simulated.Melt-electrospinning process was theoretically studied and explored from the mesoscopic perspective.Deeper comprehension of scientific issues of this physical phenomenon was acquired.