Improving the Impact Strength and Heat Resistance of 3D Printed Models: Structure, Property, and Processing Correlationships during Fused Deposition Modeling (FDM) of Poly(Lactic Acid)
Improving the Impact Strength and Heat Resistance of 3D Printed Models: Structure, Property, and Processing Correlationships during Fused Deposition Modeling (FDM) of Poly(Lactic Acid)
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DOI：
10.1021/acsomega.8b00129
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发表时间：
2018-04-01
期刊：
影响因子：
4.1
通讯作者：
Mohanty, Amar K.
中科院分区：
文献类型：
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作者：
Benwood, Claire;Anstey, Andrew;Mohanty, Amar K.
本研究采用熔融沉积建模方法，研究了通过改变印花工艺的热条件来改善聚乳酸的力学性能的可能性。样品模型是在改变广泛的打印参数的情况下制备的，包括床温、熔体温度和光栅角度。还对某些样品进行了热处理。对制备的材料进行了详细的热机械分析(差示扫描量热法、动态力学分析、热变形温度(HDT))，从而得出了几个结论。对于所有制备的样品，力学性能的关键变化与聚乳酸晶相的含量有关，这导致了样品在退火态下具有更好的性能。结果还表明，床温的提高具有非常有利的效果，其中在105℃打印的样品获得了最好的结果。与在60℃打印的参考样品相比，这些样品的冲击强度提高了80%(从35到63J/m)，HDT增加了20摄氏度(从55摄氏度增加到75摄氏度)，强度和弹性系数也显著增加。扫描电子显微镜观察证实，印刷细丝的各个层之间的扩散水平增加。
A fused deposition modeling method was used in this research to investigate the possibility of improving the mechanical properties of poly(lactic acid) by changing the thermal conditions of the printing process. Sample models were prepared while varying a wide range of printing parameters, including bed temperature, melt temperature, and raster angle. Certain samples were also thermally treated by annealing. The prepared materials were subjected to a detailed thermomechanical analysis (differential scanning calorimetry, dynamic mechanical analysis, heat deflection temperature (HDT)), which allowed the formulation of several conclusions. For all prepared samples, the key changes in mechanical properties are related to the content of the poly(lactic acid) crystalline phase, which led to superior properties in annealed samples. The results also indicate the highly beneficial effect of increased bed temperature, where the best results were obtained for the samples printed at 105 degrees C. Compared to the reference samples printed at a bed temperature of 60 degrees C, these samples showed the impact strength increased by 80% (from 35 to 63 J/m), HDT increased by 20 degrees C (from 55 to 75 degrees C), and also a significant increase in strength and modulus. Scanning electron microscopy observations confirmed the increased level of diffusion between the individual layers of the printed filament.