Flow mechanisms and their influence on the properties of EGaIn-graphene-poly(ethylene) oxide composites during material extrusion-based additive manufacturing
Flow mechanisms and their influence on the properties of EGaIn-graphene-poly(ethylene) oxide composites during material extrusion-based additive manufacturing
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DOI：
10.1016/j.addma.2024.104101
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发表时间：
2024-03
影响因子：
11
通讯作者：
Ruchira Tandel;Irmak Sargin;B. Gozen
中科院分区：
文献类型：
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作者：
Ruchira Tandel;Irmak Sargin;B. Gozen
聚合物复合材料具有室温液态合金颗粒，与其他导电填料互补，可实现独特的热性能和电性能。直接墨水写入方法是这些材料系统的一个有趣的处理路径，提供高分辨率的微观结构和性能控制。本文研究了基于材料挤出的EGaIn-石墨烯-聚氧化乙烯复合材料增材制造的组成-工艺-性能关系。特别地，通过机理方法研究了复合材料组成、印刷喷嘴尺寸和流速对导电性的影响。其中，进行毛细管流变测定和流动建模以描述剪切流动和壁滑移对油墨流动的贡献以及它们如何驱动用于各种复合油墨组合物和工艺参数的印刷结构的导电性。分别分析了组分对材料性能和工艺驱动电导率的影响。结果表明，EGaIn颗粒阻碍材料性能驱动的基线平均电导率在高石墨烯负载。剪切流和壁面滑移都增加了电导率。石墨烯和总活性材料浓度增加壁滑移并降低剪切流，导致总活性材料浓度对电导率的净负面影响。这些发现将有助于复合材料和工艺设计，以增材制造具有设计性能的复合材料。
Polymer composites featuring room temperature liquid alloy particles complimenting other conductive fillers enable unique thermal and electrical properties. Direct-ink-writing approach is an intriguing processing path for these material systems, offering high resolution microstructural and property control. This paper investigates the composition-process-property relationships for material extrusion-based additive manufacturing of EGaIn-Graphene-Poly(ethylene) Oxide composites. Particularly, the influence of composite composition, printing nozzle size and flow rate on electrical conductivity is studied through a mechanistic approach. In that, capillary rheometry and flow modeling was performed to describe the contribution of shear flow and wall slip to the ink flow and how they drive the conductivity of printed structures for various composite ink compositions and process parameters. Influence of composition on material property and process driven conductivity were separately analyzed. Results indicate that EGaIn particles hinder material property-driven baseline average conductivity at high graphene loading. Shear flow and wall slip both increase conductivity. Graphene and total active material concentration increase wall slip and decrease shear flow, leading to a net negative effect of total active material concentration on conductivity. These findings will contribute to composite and process design towards additive manufacturing of composites with as-designed properties.