Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (04): 32-37.doi: 10.13475/j.fzxb.20220303106

• Fiber Materials • Previous Articles     Next Articles

Influence of electrode loading mode on preparation in polymer melt electrowriting

LI Haoyi1,2, JIA Zichu2, LIU Yuliang2, TAN Jing2, DING Yumei2, YANG Weimin1,2, MU Wenying1,3()   

  1. 1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
    2. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    3. Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
  • Received:2022-03-09 Revised:2023-01-19 Online:2023-04-15 Published:2023-05-12

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Abstract:

Objective In recent years, melt electrowriting has attracted wide attention in biomedicine, especially in tissue engineering. The loading mode of electrodes in melt electrowriting may effluent the electrostatic distribution thus further effluent the jet deposition controlling. Relatively few studies have been conducted at home or abroad, and the difference in the effect of positive and negative high voltages loading is not completely clear. In this paper, the electric fields under two kinds of high voltage electrostatic loading are simulated, and the specific experiments are analyzed and compared to determine the influence of the two conditions on the performance parameters of melt electrowriting preparation.
Method In order to explore the difference between the positive electrode connection and the reverse electrode connection in the preparation process of melt electrowriting, ANSYS was employed to simulate the magnitude, distribution and direction of the electric field in the spinning area under different high-voltage electrostatic loading. Experimental investigation was conducted to analyze the critical voltage of jet generation, jet velocity, fibers diameter, and fibers deposition accuracy.
Results The simulation and the experimental results confirm each other. In the case of positive electrode connection, the electric field strength at the nozzle is about 14% higher than that of the reverse connection (Fig. 3), the fibers are thinner (Fig. 7), and the jet velocity is faster (Fig. 8). The critical voltage required to generate a jet at the same distance is only 35% to 74% of the reverse connection (Fig. 5). In the case of reverse electrode connection, the electric field strength of the receiving plate is about 35% higher than that of the positive connection (Fig. 3), the distribution of electric field strength is more uniform, and the direction of electric field is more consistent, which is more conducive to improving the stability of the fibers in the electric field,and the fibers deposition deviation is reduced by 35%-51% compared with that in condition positive connection (Tab. 2).
Conclusion Method that high voltage was loaded on the spinning head, enabled higher electric field intensity at the spinning area, which is more conducive to jet generation and tensile refinement, and the use of this method could improve the adaptability of melt electrowriting to materials with high viscosity. Method that high voltage was loaded on the receiving plate, enabled higher electric field intensity near the receiving area, more uniform electric field distribution and smaller component of electric field vector along the horizontal direction near the receiving plate, which could reduce the instability of jet flow and improve the deposition accuracy. These results suggested that we could connect the spinning head and the receiving plate with the opposite high voltages at the same time, taking the advantages of the two electric fields loading modes.

Key words: melt electrowriting, electric field simulation, electrospinning, polymer fiber scaffold, polycaprolactone, orientation of electric field

CLC Number: 

  • TS106.5

Fig. 1

Nozzle simulation modeling. (a) Schematic diagram of actual nozzle structure; (b) Analysis model ;(c) Mesh model"

Tab. 1

Main parameters of materials"

材料 相对介电常数 电导率/(S·m-1)
空气 1.000 6 —
不锈钢 — 1.1×105
铜 — 5.8×106
氧化铝陶瓷 9.8 —

Fig. 2

Distribution of electric field intensity. (a) Positively is connected electrode; (b) Reversely connected electrode"

Fig. 3

Relationship between electric field strength and distance from nozzle"

Fig. 4

Vector diagram of electric field intensity. (a) Positively connected electrode; (b) Reversely connected electrode"

Fig. 5

Relationship between spinning distance and critical voltage of generated jet"

Fig. 6

State of jet at different printing speeds"

Fig. 7

Relationship between spinning voltage and fibers diameter"

Fig. 8

Relationship between spinning voltage and jet velocity"

Fig. 9

Fiber deposition offset effect"

Tab. 2

Relationship between setting fibers spacing and fiber offset distanceμm"

设定纤维
间距		 纤维偏移距离
电极正接 电极反接
300 32.81 16.81
400 25.78 16.73
500 19.81 9.61
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