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首页> 美国卫生研究院文献>Polymers >The Role of the Fiber/Bead Hierarchical Microstructure on the Properties of PVDF Coatings Deposited by Electrospinning
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The Role of the Fiber/Bead Hierarchical Microstructure on the Properties of PVDF Coatings Deposited by Electrospinning

机译：纤维/珠子层次微观结构对静电纺丝沉积的PVDF涂层性能的作用

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Among the various polymeric options employed for the deposition of electrospun coatings, poly(vinylidene fluoride) (PVDF) has been widely investigated thanks to its excellent mechanical properties, high chemical resistance, and good thermal stability. In this work, the electrospinning technique is used for the fabrication of functional PVDF fibers in order to identify and evaluate the influence of the experimental conditions on the nanofiber properties in terms of optical transmittance, wettability, corrosion resistance, and surface morphology. Some of these properties can play a relevant role in the prevention of ice formation in aircrafts. According to this, a matrix of 4 × 4 samples of aluminum alloy AA 6061T6 was successfully coated by controlling two operational input parameters such as the resultant applied voltage (from 10 up to 17.5 KV) and the flow rate (from 800 up to 1400 µL/h) for a fixed polymeric precursor concentration (15 wt.%). The experimental results have shown a multilevel fiber-bead structure where the formation of a fiber mesh directly depends on the selected operational parameters. Several microscopy and surface analysis techniques such as confocal microscopy (CM), field emission scanning electron microscopy (FE-SEM), UV/vis spectroscopy, and water contact angle (WCA) were carried out in order to corroborate the morphology, transmittance, and hydrophobicity of the electrospun fiber composite. Finally, the corrosion behavior was also evaluated by electrochemical tests (Tafel curves measurement), showing that the presence of electrospun PVDF fibers produces a relevant improvement in the resultant corrosion resistance of the coated aluminum alloys.
机译：由于其优异的机械性能，高耐化学性和良好的热稳定性，所用的各种聚合物选择用于沉积电纺涂层的聚合物（偏二氟乙烯）（PVDF）被广泛研究。在这项工作中，静电纺丝技术用于制备功能性PVDF纤维，以便在光学透射率，润湿性，耐腐蚀性和表面形态方面识别和评估实验条件对纳米纤维性质的影响。其中一些属性可以在防止飞机中的冰层中发挥相关作用。据此，通过控制两个操作输入参数（例如高达17.5 kV）和流速（高达1400μL）的两个操作输入参数，通过控制两个操作输入参数来成功涂覆4×4铝合金AA 6061T6样品的矩阵。 / h）固定聚合物前体浓度（15重量％）。实验结果已经示出了多级纤维珠结构，其中纤维网的形成直接取决于所选择的操作参数。进行若干显微镜和表面分析技术，例如共聚焦显微镜（CM），场发射扫描电子显微镜（FE-SEM），UV / VI光谱和水接触角（WCA），以证实形态，透射率和电纺纤维复合材料的疏水性。最后，还通过电化学测试（Tafel曲线测量）评估腐蚀行为，表明电纺PVDF纤维的存在产生了涂覆的铝合金的所得耐腐蚀性的相关性。

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