具有优化纳米二氧化硅含量的增材制造聚乳酸的增强机械性能、热性能和抗菌性能。

Enhanced Mechanical, Thermal and Antimicrobial Properties of Additively Manufactured Polylactic Acid with Optimized Nano Silica Content.

作者信息

Vidakis Nectarios, Petousis Markos, Velidakis Emanuel, Mountakis Nikolaos, Tzounis Lazaros, Liebscher Marco, Grammatikos Sotirios A

机构信息

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

Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece.

出版信息

Nanomaterials (Basel). 2021 Apr 15;11(4):1012. doi: 10.3390/nano11041012.

The scope of this work was to create, with melt mixing compounding process, novel nanocomposite filaments with enhanced properties that industry can benefit from, using commercially available materials, to enhance the performance of three-dimensional (3D) printed structures fabricated via fused filament fabrication (FFF) process. Silicon Dioxide (SiO) nanoparticles (NPs) were selected as fillers for a polylactic acid (PLA) thermoplastic matrix at various weight % (wt.%) concentrations, namely, 0.5, 1.0, 2.0 and 4.0 wt.%. Tensile, flexural and impact test specimens were 3D printed and tested according to international standards and their Vickers microhardness was also examined. It was proven that SiO filler enhanced the overall strength at concentrations up to 1 wt.%, compared to pure PLA. Atomic force microscopy (AFM) was employed to investigate the produced nanocomposite extruded filaments roughness. Raman spectroscopy was performed for the 3D printed nanocomposites to verify the polymer nanocomposite structure, while thermogravimetric analysis (TGA) revealed the 3D printed samples' thermal stability. Scanning electron microscopy (SEM) was carried out for the interlayer fusion and fractography morphological characterization of the specimens. Finally, the antibacterial properties of the produced nanocomposites were investigated with a screening process, to evaluate their performance against () and ().

这项工作的范围是通过熔融共混复合工艺，使用市售材料制造具有增强性能的新型纳米复合长丝，以使行业受益，从而提高通过熔融长丝制造（FFF）工艺制造的三维（3D）打印结构的性能。选择二氧化硅（SiO）纳米颗粒（NPs）作为聚乳酸（PLA）热塑性基体的填料，其重量百分比（wt.%）浓度分别为0.5、1.0、2.0和4.0 wt.%。根据国际标准对3D打印的拉伸、弯曲和冲击测试样品进行测试，并检查其维氏显微硬度。结果证明，与纯PLA相比，SiO填料在浓度高达1 wt.%时可提高整体强度。采用原子力显微镜（AFM）研究制备的纳米复合挤出长丝的粗糙度。对3D打印的纳米复合材料进行拉曼光谱分析，以验证聚合物纳米复合材料的结构，同时热重分析（TGA）揭示了3D打印样品的热稳定性。对样品进行扫描电子显微镜（SEM）分析，以进行层间融合和断口形貌表征。最后，通过筛选过程研究了所制备纳米复合材料的抗菌性能，以评估其对（）和（）的性能。