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首页> 外文期刊>Journal of Applied Polymer Science >Tailoring the thermal and mechanical properties of injection-molded poly (lactic acid) parts through annealing
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Tailoring the thermal and mechanical properties of injection-molded poly (lactic acid) parts through annealing

机译：通过退火剪裁注塑聚（乳酸）零件的热和力学性能

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摘要

The effect of cold-crystallization on poly (lactic acid) (PLA) injection-molded parts was systemically investigated at different annealing temperatures (80/100/120 degrees C) and annealing times (0.5/1/1.5/2 hr). The relative crystallinity (X-c) and crystal form (alpha' and alpha) of samples was investigated by differential scanning calorimetry (DSC) and wide X-ray angle diffraction (WAXD). The dependence of the thermal and mechanical performance on relative crystallinity and crystal form/morphology was discussed in detail. A linear relationship between the increment of heat distortion temperature (HDT) and that ofX(c)was found. The tensile strength, tensile modulus and storage modulus all increased with annealing time and annealing temperature, while the tensile toughness presented a different behavior. The elongation at break for specimens reached a maximum value of 16.9% after annealing at 80 degrees C for 2 hr, which is a threefold improvement compared to PLA samples prepared without annealing. This work suggests that annealing is an effective method for tailoring the physical properties of PLA products.
机译：在不同的退火温度（80/100/120℃）和退火时间（0.5/1/1.5/2小时）下，系统研究了冷结晶对聚乳酸（PLA）注塑件的影响。采用差示扫描量热法（DSC）和广角X射线衍射法（WAXD）研究了样品的相对结晶度（X-c）和晶型（α′和α）。详细讨论了热性能和机械性能对相对结晶度和晶体形态/形貌的依赖性。发现热变形温度（HDT）的增量与x（c）的增量呈线性关系。拉伸强度、拉伸模量和储能模量均随退火时间和退火温度的增加而增加，而拉伸韧性则呈现不同的行为。在80℃下退火2小时后，试样的断裂伸长率达到最大值16.9%，与未经退火制备的PLA试样相比，这是三倍的提高。这项工作表明，退火是调整PLA产品物理性能的有效方法。

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