Arthur de Carvalho Cruzeiro, Leonardo Santana, Danay Manzo Jaime, S. Ramôa, J. L. Alves, Guilherme Mariz de Oliveira Barra
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引用次数: 0
Abstract
Purpose
This study aims to evaluate in situ oxidative polymerization of aniline (Ani) as a post-processing method to promote extrusion-based 3D printed parts, made from insulating polymers, to components with functional properties, including electrical conductivity and chemical sensitivity.
Design/methodology/approach
Extrusion-based 3D printed parts of polyethylene terephthalate modified with glycol (PETG) and polypropylene (PP) were coated in an aqueous acid solution via in situ oxidative polymerization of Ani. First, the feedstocks were characterized. Densely printed samples were then used to assess the adhesion of polyaniline (PAni) and electrical conductivity on printed parts. The best feedstock candidate for PAni coating was selected for further analysis. Last, a Taguchi methodology was used to evaluate the influence of printing parameters on the coating of porous samples. Analysis of variance and Tukey post hoc test were used to identify the best levels for each parameter.
Findings
Colorimetry measurements showed significant color shifts in PP samples and no shifts in PETG samples upon pullout testing. The incorporation of PAni content and electrical conductivity were, respectively, 41% and 571% higher for PETG in comparison to PP. Upon coating, the surface energy of both materials decreased. Additionally, the dynamic mechanical analysis test showed minimal influence of PAni over the dynamic mechanical properties of PETG. The parametric study indicated that only layer thickness and infill pattern had a significant influence on PAni incorporation and electrical conductivity of coated porous samples.
Originality/value
Current literature reports difficulties in incorporating PAni without affecting dimensional precision and feedstock stability. In situ, oxidative polymerization of Ani could overcome these limitations. However, its use as a functional post-processing of extrusion-based printed parts is a novelty.
本研究旨在评估苯胺（Ani）的原位氧化聚合作为一种后处理方法，可将绝缘聚合物制成的挤压式 3D 打印部件提升为具有导电性和化学敏感性等功能特性的部件。首先，对原料进行了表征。然后使用密集印刷的样品来评估聚苯胺（PAni）的附着力和印刷部件的导电性。最后，选择了用于 PAni 涂层的最佳候选原料进行进一步分析。最后，采用田口方法评估印刷参数对多孔样品涂层的影响。结果色度测量显示，在拉出测试中，PP 样品的颜色发生了显著变化，而 PETG 样品的颜色没有发生变化。与聚丙烯相比，PETG 的 PAni 含量和导电率分别高出 41% 和 571%。涂覆后，两种材料的表面能都有所下降。此外，动态机械分析测试表明，PAni 对 PETG 动态机械性能的影响微乎其微。参数研究表明，只有层厚度和填充模式对 PAni 的掺入和涂层多孔样品的导电性有显著影响。Ani 的原位氧化聚合可以克服这些限制。然而，将其用作挤压印刷部件的功能性后处理工艺则是一项创新。
期刊介绍：
ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric.
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CAS
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