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首页> 外文期刊>Journal of Applied Polymer Science >Instrumented Tensile and Falling Weight Impact Response of Injection-Molded #alpha#- and #beta#-Phase Polypropylene Homopolymers with Various Melt Flow Indices
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Instrumented Tensile and Falling Weight Impact Response of Injection-Molded #alpha#- and #beta#-Phase Polypropylene Homopolymers with Various Melt Flow Indices

机译：具有各种熔体流动指数的注射成型的＃alpha＃-和＃beta＃-Phase聚丙烯均聚物的仪器化拉伸和落锤冲击响应

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摘要

In this study the instrumented tensile (ITT) and falling weight impact (IFWI) behavior of injection-molded #alpah#- and #beta#-phase polypropylene (PP) homopolymers were compared at ambient temperature in a broad melt flow index (MFI = 0.7-13 dg/min) range. It was found that the toughness of #beta#-PP is superior to the #alpha#-PP: the difference between them increased with decreasing MFI or increasing molecular weight (MW). As expected, the injection molding induced skin layer thickness increased with increasing MW. Effects of the skin-core morphology were deduced indirectly by considering the results achieved on specimens molded at low and high injection speeds (v_inj = 6 and 150 mm/s), respectively. It was found that the effect of the skin-core structure is markedly stronger under uniaxial in-plane (i.e., ITI) than in biaxial out-of-plane type loading (i.e., IFWI).
机译：在这项研究中，在室温下在较宽的熔体流动指数下比较了注塑成型的＃alpah＃和＃beta＃相聚丙烯（PP）均聚物的拉伸强度（ITT）和落锤冲击（IFWI）行为。 0.7-13 dg / min）范围。发现＃beta＃-PP的韧性优于＃alpha＃-PP：它们之间的差异随着MFI的降低或分子量（MW）的增加而增加。如预期的那样，注射成型诱导的表皮层厚度随MW的增加而增加。通过分别考虑在低注射速度和高注射速度（v_inj = 6和150 mm / s）下模制的样品所获得的结果，间接推断出皮芯形态的影响。发现在单轴平面内（即ITI）下，皮芯结构的作用明显强于在双轴平面外型加载（即IFWI）下。

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