Effects of Droplet Size and Dispersion Homogeneity on the Dielectric Integrity of Liquid Metal Polymer Composites
Effects of Droplet Size and Dispersion Homogeneity on the Dielectric Integrity of Liquid Metal Polymer Composites
复制标题
DOI：
10.1109/eic55835.2023.10177339
复制
发表时间：
2023-06
期刊：
影响因子：
--
通讯作者：
Robert E. Calabrese;Elizabeth Bury;R. Green;Amanda S. Koh;Chan-Joo Park
中科院分区：
文献类型：
--
作者：
Robert E. Calabrese;Elizabeth Bury;R. Green;Amanda S. Koh;Chan-Joo Park
以优化介电完整性和弹性为目标，研究了平均液态金属液滴尺寸和分散均匀性对基于聚二甲基硅氧烷和镓铟锡合金的液态金属聚合物复合材料击穿特性的影响。制备了两组具有不同平均液滴尺寸和不同镓铟锡含量的复合材料，并测量了其局部放电起始电场和介电强度。固化后，较大的galinstan液滴沉降，而较小的液滴保持更均匀地分散在整个材料中。这种沉降效应对这些复合材料的介电强度和局部放电特性具有不利影响。有限元分析模型表明，这一现象很可能是由于液态金属液滴之间的高电场强度导致的局部放电和介质击穿。
With the goal of optimizing the dielectric integrity and resiliency, this work studies the effect of the average liquid metal droplet size and dispersion homogeneity on the breakdown properties of liquid metal polymer composites based on polydimethylsiloxane and galinstan. Two groups of composites with different average droplet size and varying galinstan concentration were fabricated, and the partial discharge inception electric field and dielectric strength were measured. Upon curing, the larger droplets of galinstan settled while the smaller droplets remained more homogenously dispersed throughout the material. This settling effect has a detrimental effect on the dielectric strength and partial discharge characteristics of these composites. Finite element analysis models show that this phenomenon is most likely caused by high electric field intensity between the liquid metal droplets leading to partial discharge and dielectric breakdown.