Characterizing the Effect of Filament Moisture on Tensile Properties and Morphology of Fused Deposition Modeled Polylactic Acid/Polybutylene Succinate Parts.

IF 2.3 4区工程技术 Q3 ENGINEERING, MANUFACTURING 3D Printing and Additive Manufacturing Pub Date : 2024-06-18 eCollection Date: 2024-06-01 DOI:10.1089/3dp.2022.0222

Raihan Quader, Evan Dramko, David Grewell, Jed Randall, Lokesh Karthik Narayanan

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Abstract

Moisture absorption into hygroscopic/hydrophilic materials used in fused deposition modeling (FDM) can diminish desired mechanical properties. Sensitivity to moisture is dependent on material properties and environmental factors and needs characterization. In this article, moisture sensitivity of four grades of polylactic acid (PLA) filaments and four different ratios of PLA/polybutylene succinate (PBS) blended filaments were characterized through FDM printed American society for testing and materials (ASTM-D638) test samples after conditioning the filaments at different relative humidity levels. The tensile testing and scanning electron microscopy (SEM) of the samples' fracture surfaces revealed that PLA 4043D was the most moisture-sensitive among the chosen grades of PLA filaments. Through filament tension test and melt flow index (MFI) testing it was observed that moisture had a significant detrimental effect (20% reduction in tensile strength and 50% increase in MFI) on PLA 4043D filaments. Samples from moisture-conditioned PLA/PBS 75/25 blended filaments displayed a significant reduction (10%) in tensile strength. Moreover, the MFI of 75/25 filaments was increased with subsequent increases in moisture level. Investigation of tensile properties of ASTM samples made from four grades of PLA filaments exposed to room temperature and humidity conditions for 3 months showed an even more significant decrease in strength (ranging from 24% to 36%).

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表征长丝水分对熔融沉积模型聚乳酸/聚丁二酸丁二醇酯部件拉伸性能和形态的影响。

熔融沉积建模（FDM）中使用的吸湿/亲水材料吸湿后会降低所需的机械性能。对湿气的敏感性取决于材料特性和环境因素，需要进行表征。本文通过在不同相对湿度水平下调节聚乳酸（PLA）长丝和四种不同比例的聚乳酸/聚丁二酸丁二醇酯（PBS）混合长丝后，通过 FDM 印刷美国测试和材料协会（ASTM-D638）测试样品对其湿度敏感性进行了表征。样品断裂面的拉伸测试和扫描电子显微镜（SEM）显示，在所选等级的聚乳酸长丝中，聚乳酸 4043D 对湿度最敏感。通过长丝拉力测试和熔体流动指数（MFI）测试发现，湿气对聚乳酸 4043D 长丝有明显的不利影响（拉伸强度降低 20%，熔体流动指数增加 50%）。经湿度调节的聚乳酸/PBS 75/25 混合长丝样品的拉伸强度显著降低（10%）。此外，75/25 长丝的 MFI 随湿度的增加而增加。对在室温和湿度条件下暴露 3 个月的由四种等级的聚乳酸长丝制成的 ASTM 样品的拉伸性能进行的调查显示，强度下降更为明显（从 24% 到 36% 不等）。

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来源期刊

3D Printing and Additive Manufacturing Materials Science-Materials Science (miscellaneous)

CiteScore

6.00

自引率

6.50%

发文量

126

期刊介绍： 3D Printing and Additive Manufacturing is a peer-reviewed journal that provides a forum for world-class research in additive manufacturing and related technologies. The Journal explores emerging challenges and opportunities ranging from new developments of processes and materials, to new simulation and design tools, and informative applications and case studies. Novel applications in new areas, such as medicine, education, bio-printing, food printing, art and architecture, are also encouraged. The Journal addresses the important questions surrounding this powerful and growing field, including issues in policy and law, intellectual property, data standards, safety and liability, environmental impact, social, economic, and humanitarian implications, and emerging business models at the industrial and consumer scales.