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The effect of injection speed on morphology and mechanical properties of Polyoxymethylene/Poly(lactic acid) blends

机译：注射速度对聚甲醛/聚（乳酸）共混物形态和力学性能的影响

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Polyoxymethylene (POM)/Poly(lactic acid)(PLA) blends were injection molded at three different injection speeds as 50 mm/s, 100 mm/s and 300 mm/s for investigation the effect of injection speed on morphology and mechanical properties of this blends. The tensile test was carried out for examination of mechanical properties. Morphology was observed by polarized optical microscope and polarizing micrographs that was supported by Raman spectra. At injection speed of 50 mm/s, mechanical properties of POM/PLA blends increased with decreasing POM content but when 20 %wt of POM was added into PLA, the results dropped obviously due to a poor distribution of both POM and PLA phases. That can be confirmed by polarizing micrographs and Raman spectra. It was found that the POM-rich phase mostly combined in the core area. The dispersion of POM-rich phase expanded to a wide area when the injection speed increased to 100 mm/s and 300 mm/s, respectively. The improvement of distribution of POM-rich phase has an influence on the enhancement of mechanical properties. Tensile modulus of POM 20 wt.% increased from 2.8 GPa to 3.0 GPa while its tensile strength increased from 50.5 MPa to 55 MPa. Thus, the high injection speed can enhanced the phase distribution and mechanical properties at low POM content but has not a significant effect when POM content over 40 %wt.
机译：将聚甲醛（POM）/聚（乳酸）（PLA）共混物在三种不同的喷射速度下注射成型为50mm / s，100mm / s和300mm / s，用于调查注射速度对形态和机械性能的影响这融合了。进行拉伸试验以检查机械性能。通过偏振光光学显微镜观察形态，并通过拉曼光谱支撑的偏振显微照片。在注射速度为50mm / s的情况下，POM / PLA共混物的机械性能随着POM含量的降低而增加，但当加入到PLA中加入20％的POM时，由于POM和PLA阶段的分布差，结果显然显着降低。可以通过偏振显微照片和拉曼光谱来确认。发现富有的POM富相位在核心区域中大多组合。当注射速度增加到100mm / s和300mm / s时，富含POM的相位的分散膨胀到宽面积。富含POM的阶段分布的改善对机械性能的增强有影响。 POM 20重量的拉伸模量从2.8GPa增加到3.0GPa，而其拉伸强度从50.5MPa增加到55MPa。因此，高注射速度可以在低POM含量下增强相位分布和机械性能，但是当POM含量超过40％wt时没有显着效果。

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