Ding Chenhui, Fang Hong, Duan Gaigai, Zou Yan, Chen Shuiliang, Hou Haoqing
College of Chemistry and Chemical Engineering, Jiangxi Normal University Nanchang 330027 China
College of Materials Science and Engineering, Nanjing Forestry University Nanjing 210037 China
RSC Adv. 2019 May 2;9(24):13608-13613. doi: 10.1039/c9ra02024a. eCollection 2019 Apr 30.
The investigation of the draw ratio and velocity of an electrospinning polymer solution jet is of great interest for understanding the formation of nanofibers. During the electrospinning process, the charged polymer solution jets were stretched by electric force, resulting in the formation of ultrathin fibers. In this study, theoretical deduction and experimental calculation were applied to evaluate the velocities and draw ratios of the charged jets at different electrospinning stages. Depending on the diameter of the charged jets at different electrospinning stages, the velocities and draw ratios of the charged jets were calculated with values far lower than the data in a previous report. The theoretical calculation was compared with experimental data using polyamic acid as a model polymer for electrospinning. The results indicated that during electrospinning, as the collecting distance was increased from 0 to 30 cm, the diameter of the electrospinning jet decreased from 18 800 nm to a constant value of around 245 nm, the solvent in the jet decreased from 96.50 wt% to 25.45 wt%, and the density of the jet increased from 0.9504 to 1.0995 g cm. These parameters led to the draw ratio and velocity of the jet experiencing first an increase and then a decrease in the value, and the highest draw ratio and velocity were 869 and 867 m s, respectively, which are quite different from the data in previous reports.
研究静电纺丝聚合物溶液射流的拉伸比和速度对于理解纳米纤维的形成具有重要意义。在静电纺丝过程中，带电的聚合物溶液射流受到电场力的拉伸，从而形成超细微纤维。在本研究中，运用理论推导和实验计算来评估不同静电纺丝阶段带电射流的速度和拉伸比。根据不同静电纺丝阶段带电射流的直径，计算出的带电射流速度和拉伸比的值远低于先前报告中的数据。以聚酰胺酸作为静电纺丝的模型聚合物，将理论计算结果与实验数据进行了比较。结果表明，在静电纺丝过程中，随着收集距离从0增加到30 cm，静电纺丝射流的直径从18800 nm减小到约245 nm的恒定值，射流中的溶剂从96.50 wt%减少到25.45 wt%，射流的密度从0.9504增加到1.0995 g/cm。这些参数导致射流的拉伸比和速度的值先增加后减小，最高拉伸比和速度分别为869和867 m/s，这与先前报告中的数据有很大差异。
