3D打印参数对聚乳酸力学性能的影响

摘要

Polylactic acid (PLA) samples were prepared by three-dimensional (3D) printing.The effect of printing temperature,speed,orientation and heating installation's temperature on the tensile and flexural properties of PLA was discussed.The results show that proper printing temperature can improve weld lines of samples.The faster printing speed can enhance the orientation of PLA molecular chains.The proper heating installation's temperature is beneficial to the formation and growth of crystal,enhance mechanical properties of PLA.The mechanical properties of longitudinal-printed samples are generally superior to transverse-printed.The mechanical properties of PLA show the best when the printing temperature,speed,orientation and heating installation's temperature are 210 ～215 ℃,80 mm/s,longitudinal and 50 ℃,respectively.%通过3D打印制备了聚乳酸试样.研究了打印温度、速度、方向和热床温度等打印参数对PLA拉伸和弯曲性能的影响.结果表明,适当的打印温度能改善试样内部层与层之间的熔接痕缺陷.较高的打印速度增强了PLA分子链的取向;适当的热床温度有利于PLA晶体的形成和生长,从而提高其力学性能.纵向打印试样的力学性能普遍优于横向打印的.当打印温度、速度、方向和热床温度分别为(210 ～215℃)、80 mm/s、纵向和50℃时,PLA试样的综合力学性能最佳.