The electrodynamics of the polymer melt as well as its effects on fiber spinnability in the framework of laser-heated melt electrospinning was investigated. We challenge the classic views in the aspects of the molten Taylor-cone, the thinning process, and the jet deformation. A temperature-voltage phase diagram was constructed to distinguish the regimes of the bending, the whipping, and the break-up of the jet. These jet kinematics are significantly dependent on the molten Taylor-cone, the jet thinning, and the forces exerted on the jet. The surface tension restricts the growth of the jet while it can be safely neglected after jet initiation. Jet breaks up periodically at the tip of Taylor-cone if the polymer viscosity is too low or the elongation rate is not high enough to stretch the jet. The elongation rate for each segment of the jet keeps almost constant at a certain melt temperature, while the elongation rate increases and the solidification point of the jet shifts from the Taylor-cone to the target with increasing melt temperature. An analytic equation is proposed to estimate the jet diameter along the spinline before jet solidifies. Additionally, the experiment of coiling proved that the electrical and the elastic as the dominant forces for bending are gradually replaced by the inertial and the viscous forces for whipping.

在激光加热的熔体静电纺丝框架内，研究了聚合物熔体的电动力学及其对纤维可纺性的影响。我们在熔融泰勒锥，稀化过程和射流变形方面挑战经典观点。构造了一个温度-电压相位图，以区分射流的弯曲，搅动和破裂状态。这些射流运动学很大程度上取决于熔融的泰勒锥，射流变薄以及作用在射流上的力。表面张力限制了射流的生长，而在射流启动后可以安全地忽略它。如果聚合物粘度太低或伸长率不足以拉伸射流，则射流会在泰勒锥的顶端周期性断裂。在一定的熔体温度下，射流各段的伸长率几乎保持恒定，而随着熔体温度的升高，伸长率增加，射流的凝固点从泰勒锥向靶转变。提出了一个解析方程式来估计射流凝固之前沿旋转线的射流直径。此外，盘绕实验证明，弯曲的主要作用力是电和弹性，逐渐被搅打的惯性力和粘性力所代替。