Characterizing the Effect of Filament Moisture on Tensile Properties and Morphology of Fused Deposition Modeled Polylactic Acid/Polybutylene Succinate Parts
Characterizing the Effect of Filament Moisture on Tensile Properties and Morphology of Fused Deposition Modeled Polylactic Acid/Polybutylene Succinate Parts
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DOI：
10.1089/3dp.2022.0222
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发表时间：
2023-03
影响因子：
3.1
通讯作者：
Raihan Quader;Evan Dramko;D. Grewell;J. Randall;L. Narayanan
中科院分区：
文献类型：
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作者：
Raihan Quader;Evan Dramko;D. Grewell;J. Randall;L. Narayanan
熔融沉积成型（FDM）中使用的吸湿/亲水材料的吸湿会降低所需的机械性能。对水分的敏感性取决于材料特性和环境因素，需要进行表征。采用美国材料与试验协会（ASTM-D 638）的FDM测试方法，对4种不同等级的聚乳酸（PLA）长丝和4种不同比例的PLA/聚丁二酸丁二醇酯（PBS）共混长丝在不同相对湿度条件下进行湿敏性测试。拉伸测试和扫描电子显微镜（SEM）的样品的断裂表面显示，PLA 4043 D是最湿敏感的PLA长丝中选择的等级。通过长丝张力测试和熔体流动指数（MFI）测试，观察到水分对PLA 4043 D长丝具有显著的不利影响（拉伸强度降低20%和MFI增加50%）。来自经水分调节的PLA/PBS 75/25共混长丝的样品显示出拉伸强度的显著降低（10%）。此外，75/25长丝的MFI随着随后的水分水平的增加而增加。对由暴露于室温和湿度条件下3个月的四个等级的PLA长丝制成的ASTM样品的拉伸性能的研究显示强度甚至更显著地降低（范围从24%至36%）。
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%).