Ura Daniel P, Rosell-Llompart Joan, Zaszczyńska Angelika, Vasilyev Gleb, Gradys Arkadiusz, Szewczyk Piotr K, Knapczyk-Korczak Joanna, Avrahami Ron, Šišková Alena O, Arinstein Arkadii, Sajkiewicz Paweł, Zussman Eyal, Stachewicz Urszula
International Centre of Electron Microscopy for Materials Science, Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland.
Department of Chemical Engineering, Universitat Rovira i Virgili, Av. dels Països Catalans 26, 43007 Tarragona, Spain.
Materials (Basel). 2020 Sep 19;13(18):4169. doi: 10.3390/ma13184169.
Electric field strength and polarity in electrospinning processes and their effect on process dynamics and the physical properties of as-spun fibers is studied. Using a solution of the neutral polymer such as poly(methyl methacrylate) (PMMA) we explored the electrospun jet motion issued from a Taylor cone. We focused on the straight jet section up to the incipient stage of the bending instability and on the radius of the disk of the fibers deposited on the collecting electrode. A new correlation formula using dimensionless parameters was found, characterizing the effect of the electric field on the length of the straight jet, L˜E~E˜0.55. This correlation was found to be valid when the spinneret was either negatively or positively charged and the electrode grounded. The fiber deposition radius was found to be independent of the electric field strength and polarity. When the spinneret was negatively charged, L˜E was longer, the as-spun fibers were wider. The positively charged setup resulted in fibers with enhanced mechanical properties and higher crystallinity. This work demonstrates that often-overlooked electrical polarity and field strength parameters influence the dynamics of fiber electrospinning, which is crucial for designing polymer fiber properties and optimizing their collection.
研究了静电纺丝过程中的电场强度和极性及其对过程动力学和初生纤维物理性能的影响。使用中性聚合物溶液，如聚甲基丙烯酸甲酯（PMMA），我们探索了从泰勒锥喷出的静电纺丝射流运动。我们关注直到弯曲不稳定性初始阶段的直射流部分以及沉积在收集电极上的纤维盘的半径。发现了一个使用无量纲参数的新关联公式，表征电场对直射流长度的影响，L˜E~E˜0.55。当喷丝头带负电或正电且电极接地时，该关联被发现是有效的。发现纤维沉积半径与电场强度和极性无关。当喷丝头带负电时，L˜E更长，初生纤维更宽。带正电的设置导致纤维具有增强的机械性能和更高的结晶度。这项工作表明，常被忽视的电极性和场强参数会影响纤维静电纺丝的动力学，这对于设计聚合物纤维性能和优化其收集至关重要。
