Investigation on the Printability of Recycled Thermoplastic Polyurethane/Carbon Nanotube Nanocomposites

IF 2.4 3区 工程技术 Q3 ENGINEERING, MANUFACTURING
F. Stan, I. Sandu, C. Fetecau
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引用次数: 0

Abstract

Although the production of polymer/carbon nanotube (CNT) nanocomposites has grown exponentially over the last years for a variety of applications, the availability of polymer/CNT filaments for the use in commercial 3D printing systems is very limited and, currently, little is known about the printability of recycled polymer/CNT nanocomposites. In this respect, the fused filament fabrication (FFF) of recycled thermoplastic polyurethane/carbon nanotube (TPU/CNT) nanocomposites was investigated with special focus on the piezoresistive behavior. Mechanically recycled and virgin TPU/CNT nanocomposites with different CNT contents (0.5, 1, 3, and 5 wt% by weight) were subjected to filament extrusion and FFF, and the changes induced by mechanical recycling, CNT contents and infill orientation were monitored by melt flow index, thermal, mechanical, electrical and piezoresistive properties. It was found that the recycled TPU nanocomposites exhibit very good printability with mechanical and electrical properties that are generally comparable with those for the virgin nanocomposites, the decrease of the elongation at break at 5 wt% CNTs being the primary challenge for the mechanical recycling of TPU/CNT nanocomposites. The 3D printed recycled TPU/CNT nanocomposites with 3 wt% and 5 wt% CNTs provide very good strain sensing behavior, with sensitivity and stretchability higher than those of the virgin nanocomposites. The findings of this work provide guidance for assessing the potential of using recycled TPU/CNT nanocomposites for 3D printing strain sensors with tuned sensitivity for a wide range of human motions.
再生热塑性聚氨酯/碳纳米管纳米复合材料的可印刷性研究
尽管在过去几年中,聚合物/碳纳米管(CNT)纳米复合材料的生产在各种应用中呈指数级增长,但用于商业3D打印系统的聚合物/CNT细丝的可用性非常有限,并且目前对回收聚合物/CNT纳米复合材料的可打印性知之甚少。在这方面,研究了再生热塑性聚氨酯/碳纳米管(TPU/CNT)纳米复合材料的熔融丝制备(FFF),特别关注压阻行为。对具有不同CNT含量(0.5、1、3和5wt%)的机械回收和原始TPU/CNT纳米复合材料进行细丝挤出和FFF,并通过熔体流动指数、热、机械、电学和压阻性能监测机械回收、CNT含量和填充取向引起的变化。发现回收的TPU纳米复合材料表现出非常好的印刷性,其机械和电学性能通常与原始纳米复合材料的机械和电学性质相当,在5wt%CNTs时断裂伸长率的降低是TPU/CNT纳米复合材料机械回收的主要挑战。具有3wt%和5wt%CNT的3D打印回收TPU/CNT纳米复合材料提供了非常好的应变传感行为,其灵敏度和拉伸性高于原始纳米复合材料。这项工作的发现为评估使用回收的TPU/CNT纳米复合材料用于3D打印应变传感器的潜力提供了指导,该传感器对广泛的人体运动具有调谐的灵敏度。
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来源期刊
CiteScore
6.80
自引率
20.00%
发文量
126
审稿时长
12 months
期刊介绍: Areas of interest including, but not limited to: Additive manufacturing; Advanced materials and processing; Assembly; Biomedical manufacturing; Bulk deformation processes (e.g., extrusion, forging, wire drawing, etc.); CAD/CAM/CAE; Computer-integrated manufacturing; Control and automation; Cyber-physical systems in manufacturing; Data science-enhanced manufacturing; Design for manufacturing; Electrical and electrochemical machining; Grinding and abrasive processes; Injection molding and other polymer fabrication processes; Inspection and quality control; Laser processes; Machine tool dynamics; Machining processes; Materials handling; Metrology; Micro- and nano-machining and processing; Modeling and simulation; Nontraditional manufacturing processes; Plant engineering and maintenance; Powder processing; Precision and ultra-precision machining; Process engineering; Process planning; Production systems optimization; Rapid prototyping and solid freeform fabrication; Robotics and flexible tooling; Sensing, monitoring, and diagnostics; Sheet and tube metal forming; Sustainable manufacturing; Tribology in manufacturing; Welding and joining
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