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以导电聚合物复合材料的电阻率为例，探讨材料挤出过程参数对产品性能的影响。

Influence of Process Parameters in Material Extrusion on Product Properties Using the Example of the Electrical Resistivity of Conductive Polymer Composites.

作者信息

Nowka Maximilian, Hilbig Karl, Schulze Lukas, Jung Eggert, Vietor Thomas

机构信息

Institute for Engineering Design, Technische Universität Braunschweig, Hermann-Blenk-Str. 42, 38108 Brunswick, Germany.

出版信息

Polymers (Basel). 2023 Nov 17;15(22):4452. doi: 10.3390/polym15224452.

DOI:10.3390/polym15224452
PMID:38006176
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10675492/
Abstract

Additive manufacturing of components using the material extrusion (MEX) of thermoplastics enables the integration of multiple materials into a single part. This can include functional structures, such as electrically conductive ones. The resulting functional structure properties depend on the process parameters along the entire manufacturing chain. The aim of this investigation is to determine the influence of process parameters in filament production and additive manufacturing on resistivity. Filament is produced from a commercially available composite of polylactide (PLA) with carbon nanotubes (CNT) and carbon black (CB), while the temperature profile and screw speed were varied. MEX specimens were produced using a full-factorial variation in extrusion temperature, layer height and deposition speed from the most and least conductive in-house-produced filament and the commercially available filament from the same composite. The results show that the temperature profile during filament production influences the resistivity. The commercially available filament has a lower conductivity than the in-house-produced filament, even though the starting feedstock is the same. The process parameters during filament production are the main factors influencing the resistivity of an additively manufactured structure. The MEX process parameters have a minimal influence on the resistivity of the used PLA/CNT/CB composite.

摘要

使用热塑性塑料的材料挤出（MEX）工艺进行部件的增材制造，能够将多种材料集成到单个部件中。这可以包括功能性结构，比如导电结构。所得到的功能性结构特性取决于整个制造链中的工艺参数。本研究的目的是确定长丝生产和增材制造过程中的工艺参数对电阻率的影响。长丝由市售的聚乳酸（PLA）与碳纳米管（CNT）和炭黑（CB）的复合材料制成，同时改变温度曲线和螺杆转速。使用全因子变化法，从导电性最强和最弱的自制长丝以及相同复合材料的市售长丝中，以不同的挤出温度、层高和沉积速度制作MEX试样。结果表明，长丝生产过程中的温度曲线会影响电阻率。即使起始原料相同，市售长丝的导电性也低于自制长丝。长丝生产过程中的工艺参数是影响增材制造结构电阻率的主要因素。MEX工艺参数对所使用的PLA/CNT/CB复合材料的电阻率影响极小。

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