Production and 3D printing processing of bio-based thermoplastic filament
Production and 3D printing processing of bio-based thermoplastic filament
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DOI：
10.1051/mfreview/2016020
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发表时间：
2017-01-09
影响因子：
2.5
通讯作者：
Charitidis, Costas A.
中科院分区：
文献类型：
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作者：
Gkartzou, Eleni;Koumoulos, Elias P.;Charitidis, Costas A.
在这项工作中，采用基于挤出的3D打印技术来加工聚乳酸（PLA）与低成本硫酸盐木质素的生物基共混物。在熔丝制造（FFF）3D打印过程中，通过熔化，挤出和选择性地将热塑性纤维沉积在平台上，以逐层的方式构建物体。这些纤维可用作具有明确微架构的更复杂结构的构建块，采用自动化、经济高效的工艺，材料浪费最少。由木质素生物聚合物与聚（乳酸）共混组成的可持续材料的物理性能和FFF过程中的熔融加工性进行了检查。制备了具有不同PLA/木质素重量比的样品，并研究了它们的机械（拉伸测试）、热（差示扫描量热法分析）和形态（光学和扫描电子显微镜，SEM）性能。选择具有最佳性能的组合物用于生产3D打印长丝。研究了影响熔体剪切速率和应力的三个工艺参数：挤出温度、印刷速度和纤维宽度的变化，并评估了它们对挤出物形态的影响。通过拉伸测试和SEM断口分析评估了3D打印试样的机械性能。
In this work, an extrusion-based 3D printing technique was employed for processing of biobased blends of Poly(Lactic Acid) (PLA) with low-cost kraft lignin. In Fused Filament Fabrication (FFF) 3D printing process, objects are built in a layer-by-layer fashion by melting, extruding and selectively depositing thermoplastic fibers on a platform. These fibers are used as building blocks for more complex structures with defined microarchitecture, in an automated, cost-effective process, with minimum material waste. A sustainable material consisting of lignin biopolymer blended with poly(lactic acid) was examined for its physical properties and for its melt processability during the FFF process. Samples with different PLA/lignin weight ratios were prepared and their mechanical (tensile testing), thermal (Differential Scanning Calorimetry analysis) and morphological (optical and scanning electron microscopy, SEM) properties were studied. The composition with optimum properties was selected for the production of 3D-printing filament. Three process parameters, which contribute to shear rate and stress imposed on the melt, were examined: extrusion temperature, printing speed and fiber's width varied and their effect on extrudates' morphology was evaluated. The mechanical properties of 3D printed specimens were assessed with tensile testing and SEM fractography.