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

doi:10.7503/cjcu20160878

Abstract

Abstract:

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.

Key words: Dissipative particle dynamics, Control frequency, Stretching, Jet diameter, Falling velocity

CLC Number:

O643

TrendMD:

SONG Qingsong, ZHANG Jingnan, LIU Yong. Mesoscale Simulation of a Melt Electrospinning Jet in a Periodically Changing Electric Field[J]. Chem. J. Chinese Universities, 2017, 38(6): 966.

Figures/Tables 7

Fig.1 Electrospinning device and voltage format(A) Schematic diagram of a common stable field electrospinning device; (B) positive voltage changes with an increase in steps: the stable electric field is V0 (solid line); the absolute sine wave electric field(ASWEF) is changing as V1|sin(B·step)|. B=1 in this picture(dotted line).

Fig.2 Modeling systems corresponding to the jetting process(A) Experimental system; (B) simulation system; (C) schematic representation of the molecular chains in a polymer jet.

Fig.3 Mean value of polymer chain stretching(r) in a stable electric field and under ASWEF conditions with varying control frequency B

Fig.4 Polymer jet diameters at varying control frequencies for the ASWEF Frequency 0 represents the stable electric field.

Fig.5 Changes in positive voltage at different control frequencies in an ASWEFGreen dots represent the voltage at certain steps, with each green dot and red line corresponding to one step.(A) B=2; (B) B=3; (C) B=5; (D) B=10; (E) B=18; (F) B=30.

Fig.6 Falling process of a jetting fiber at various calculation steps in a stable electric field(A1—F1) and an ASWEF at B=2(A2—F2) Step: (A1, A2) 10; (B1, B2) 1010; (C1, C2) 2010; (D1, D2) 3010; (E1, E2) 4010; (F1, F2) 4440.

Fig.7 Snapshots of a falling jet(A) and the corresponding falling distances(B) under ASWEF conditions at different control frequencies after 4000 steps Control frequency 0 corresponds to a stable electric field.

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