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Herein, polytetrafluoroethylene (PTFE) is evaluated as a reinforcement agent in material extrusion (MEX) additive manufacturing (AM), aiming to develop nanocomposites with enhanced mechanical performance. Loadings up to 4.0 wt.% were introduced as fillers of polylactic acid (PLA) and polyamide 12 (PA12) matrices. Filaments for MEX AM were prepared to produce corresponding 3D-printed samples. For the thorough characterization of the nanocomposites, a series of standardized mechanical tests were followed, along with AFM, TGA, Raman spectroscopy, EDS, and SEM analyses. The results showed an improved mechanical response for filler concentrations between 2.0 and 3.0 wt.%. The enhancement for the PLA/PTFE 2.0 wt.% in the tensile strength reached 21.1% and the modulus of elasticity 25.5%; for the PA12/PTFE 3.0 wt.%, 34.1%, and 41.7%, respectively. For PLA/PTFE 2.0 wt.%, the enhancement in the flexural strength reached 57.6% and the modulus of elasticity 25.5%; for the PA12/PTFE 3.0 wt.%, 14.7%, and 17.2%, respectively. This research enables the ability to deploy PTFE as a reinforcement agent in the PA12 and PLA thermoplastic engineering polymers in the MEX AM process, expanding the potential applications.

Nanocomposites with Optimized Polytetrafluoroethylene Content as a Reinforcement Agent in PA12 and PLA for Material Extrusion Additive Manufacturing.

作者信息

Vidakis Nectarios, Petousis Markos, Moutsopoulou Amalia, Papadakis Vassilis, Spiridaki Mariza, Mountakis Nikolaos, Charou Chrysa, Tsikritzis Dimitris, Maravelakis Emmanuel

机构信息

Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece.

Department of Industrial Design and Production Engineering, University of West Attica, 12244 Athens, Greece.

出版信息

Polymers (Basel). 2023 Jun 22;15(13):2786. doi: 10.3390/polym15132786.

在此，聚四氟乙烯（PTFE）被评估为材料挤出（MEX）增材制造（AM）中的增强剂，旨在开发具有增强机械性能的纳米复合材料。引入高达4.0 wt.% 的PTFE作为聚乳酸（PLA）和聚酰胺12（PA12）基体的填料。制备了用于MEX AM的长丝，以生产相应的3D打印样品。为了全面表征纳米复合材料，进行了一系列标准化的力学测试，以及原子力显微镜（AFM）、热重分析（TGA）、拉曼光谱、能谱分析（EDS）和扫描电子显微镜（SEM）分析。结果表明，当填料浓度在2.0至3.0 wt.% 之间时，纳米复合材料的机械响应得到改善。PLA/PTFE 2.0 wt.% 的拉伸强度提高了21.1%，弹性模量提高了25.5%；PA12/PTFE 3.0 wt.% 的拉伸强度和弹性模量分别提高了34.1% 和41.7%。对于PLA/PTFE 2.0 wt.%，弯曲强度提高了57.6%，弹性模量提高了25.5%；对于PA12/PTFE 3.0 wt.%，弯曲强度和弹性模量分别提高了14.7% 和17.2%。本研究使得在MEX AM工艺中能够将PTFE用作PA12和PLA热塑性工程聚合物的增强剂，从而拓展了潜在应用。