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首页> 外文期刊>Journal of Polymer Science, Part B. Polymer Physics >Effect of biaxial orientation on dielectric and breakdown properties of poly(ethylene terephthalate)/poly(vinylidene fluoride-co-tetrafluoroethylene) multilayer films
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Effect of biaxial orientation on dielectric and breakdown properties of poly(ethylene terephthalate)/poly(vinylidene fluoride-co-tetrafluoroethylene) multilayer films

机译：双轴取向对聚对苯二甲酸乙二醇酯/聚偏二氟乙烯-共-四氟乙烯多层膜的介电和击穿性能的影响

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Polymer films with enhanced dielectric and breakdown properties are essential for the production of high energy density polymer film capacitors. By capitalizing on the synergistic effects of forced assembly nanolayer coextrusion and biaxial orientation, polymer multilayer films using poly(ethylene terephthalate) (PET) and a poly(vinylidene fluoride-co-tetrafluoroethylene) [P(VDF-TFE)] copolymer were produced. These films exhibited breakdown fields, under a divergent field using needle/plane electrodes, as high as 1000 kV mm~(-1). The energy densities of these same materials, under a uniform electric field measured using plane/plane electrodes, were as high as 16 J cm~(-3). The confined morphologies of both PET and P(VDF-TFE) were correlated to the observed breakdown properties and damage zones. On-edge P(VDF-TFE) crystals induced from solid-state biaxial stretching enhanced the effective P(VDF-TFE) layer dielectric constant and therefore increased the dielectric contrast between the PET and P(VDF-TFE) layers. This resulted in additional charge buildup at the layer interface producing larger tree diameters and branches and ultimately increasing the breakdown and energy storage properties. In addition to energy storage and breakdown properties, the hysteresis behavior of these materials was also evaluated. By varying the morphology of the P(VDF-TFE) layer, the low-field dielectric loss (or ion migration behavior) could be manipulated, which in turn also changed the observed hysteresis behavior.
机译：具有增强的介电和击穿特性的聚合物薄膜对于生产高能量密度聚合物薄膜电容器至关重要。通过利用强制组装纳米层共挤出和双轴取向的协同效应，制备了使用聚对苯二甲酸乙二醇酯（PET）和聚偏二氟乙烯-共-四氟乙烯[P（VDF-TFE）]共聚物的聚合物多层膜。在使用针/平面电极的发散场下，这些膜表现出击穿场，击穿场高达1000 kV mm〜（-1）。在使用平面/平面电极测量的均匀电场下，这些相同材料的能量密度高达16 J cm〜（-3）。 PET和P（VDF-TFE）的局限形态与观察到的击穿特性和损伤区域相关。固态双轴拉伸诱导的边缘P（VDF-TFE）晶体增强了有效P（VDF-TFE）层的介电常数，因此提高了PET和P（VDF-TFE）层之间的介电对比度。这导致在层界面处的额外电荷累积，从而产生更大的树直径和分支，并最终增加了击穿和能量存储特性。除了能量存储和击穿特性，还评估了这些材料的磁滞行为。通过改变P（VDF-TFE）层的形态，可以控制低场介电损耗（或离子迁移行为），进而改变了观察到的磁滞行为。

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