Prasong Wattanachai, Ishigami Akira, Thumsorn Supaphorn, Kurose Takashi, Ito Hiroshi
Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
Research Center for GREEN Materials and Advanced Processing (GMAP), 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
Polymers (Basel). 2021 Feb 27;13(5):740. doi: 10.3390/polym13050740.
Poly(lactic acid) (PLA) filaments have been the most used in fused deposition modeling (FDM) 3D printing. The filaments, based on PLA, are continuing to be developed to overcome brittleness, low heat resistance, and obtain superior mechanical performance in 3D printing. From our previous study, the binary blend composites from PLA and poly(butylene adipate-co-terephthalate) (PBAT) with nano talc (PLA/PBAT/nano talc) at 70/30/10 showed an improvement in toughness and printability in FDM 3D printing. Nevertheless, interlayer adhesion, anisotropic characteristics, and heat resistance have been promoted for further application in FDM 3D printing. In this study, binary and ternary blend composites from PLA/PBAT and poly(butylene succinate) (PBS) with nano talc were prepared at a ratio of PLA 70 wt. % and blending with PBAT or PBS at 30 wt. % and nano talc at 10 wt. %. The materials were compounded via a twin-screw extruder and applied to the filament using a capillary rheometer. PLA/PBAT/PBS/nano talc blend composites were printed using FDM 3D printing. Thermal analysis, viscosity, interlayer adhesion, mechanical properties, and dimensional accuracy of binary and ternary blend composite 3D prints were investigated. The incorporation of of PBS-enhanced crystallinity of the blend composite 3D prints resulted in an improvement to mechanical properties, heat resistance, and anisotropic characteristics. Flexibility of the blend composites was obtained by presentation of PBAT. It should be noted that the core-shell morphology of the ternary blend influenced the reduction of volume shrinkage, which obtained good surface roughness and dimensional accuracy in the ternary blend composite 3D printing.
聚乳酸（PLA）长丝在熔融沉积建模（FDM）3D打印中应用最为广泛。基于PLA的长丝不断发展，以克服脆性、低耐热性，并在3D打印中获得优异的机械性能。根据我们之前的研究，由聚乳酸（PLA）、聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯）（PBAT）和纳米滑石粉组成的二元共混复合材料（PLA/PBAT/纳米滑石粉，比例为70/30/10）在FDM 3D打印中的韧性和可打印性有所提高。然而，为了在FDM 3D打印中进一步应用，层间附着力、各向异性特性和耐热性仍有待提高。在本研究中，制备了由PLA/PBAT和聚丁二酸丁二醇酯（PBS）与纳米滑石粉组成的二元和三元共混复合材料，其中PLA的比例为70 wt.%，与30 wt.%的PBAT或PBS以及10 wt.%的纳米滑石粉混合。这些材料通过双螺杆挤出机进行复合，并使用毛细管流变仪制成丝状。采用FDM 3D打印技术打印PLA/PBAT/PBS/纳米滑石粉共混复合材料。研究了二元和三元共混复合材料3D打印件的热分析、粘度、层间附着力、机械性能和尺寸精度。加入PBS提高了共混复合材料3D打印件的结晶度，从而改善了机械性能、耐热性和各向异性特性。PBAT的加入使共混复合材料具有柔韧性。值得注意的是，三元共混物的核壳形态影响了体积收缩率的降低，使得三元共混复合材料3D打印具有良好的表面粗糙度和尺寸精度。
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