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Electric field distribution and initial jet motion induced by spinneret configuration for molecular orientation in electrospun fibers

机译:喷丝头纤维分子取向诱导的电场分布和初始喷射运动

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Understanding the molecular orientation of electrospun fibers is a key challenge for tailoring fiber properties. The studies of electric field distribution, and the motion of the initial portion of the polymer jet, are of interest for clarifying molecular orientation in fibers during electrospinning. In this work, we study the impact of electric field distribution and the initial jet motion induced by two kinds of spinneret configurations, referred to as a needle configuration and a hole configuration, on molecular orientation in electrospun PEO fibers. Using FE-SEM, FTIR and WAXD techniques, the fiber diameter and molecular orientation of the fibers prepared with the needle electrospinning system and the hole electrospinning system are characterized. To explore jet stretching and chain orientation during the spinning process, electric field simulation and high-speed photography are performed to obtain the electric field characteristics and to measure the initial jet velocities for the needle and the hole systems. Our results reveal the higher electric field strength around the spinneret and the larger initial jet velocities, which depend on the spinneret configuration, result in the higher degree of molecular orientation in fibers.
机译:理解电纺纤维的分子取向是剪裁纤维性能的关键挑战。用于电场分布的研究和聚合物射流的初始部分的运动,对于在静电纺丝期间澄清纤维中的分子取向感兴趣。在这项工作中,我们研究了电场分布和初始喷射运动的影响,由两种喷丝头构造引起的两种喷丝孔配置和孔构造,在ElectrompOM PEO纤维中的分子取向上。使用Fe-SEM,FTIR和WAXD技术,表征了用针静电纺丝系统和空穴静电纺丝系统制备的纤维直径和分子取向。为了探索纺纱过程中的喷射拉伸和链取向,执行电场模拟和高速摄影以获得电场特性,并测量针和孔系统的初始喷射速度。我们的结果揭示了喷丝头周围的较高的电场强度和较大的初始喷射速度,这取决于喷丝头配置,导致纤维中的较高程度的分子取向。

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