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Fabrication of super-ductile PP/LDPE blended parts with a chemical blowing agent

机译：用化学发泡剂制造超韧性PP / LDPE混合零件

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The mechanical blending of polypropylene (PP) and low density polyethylene (LDPE) is an economical and simple method for producing new polymeric materials for specific applications. However, the reduction in strain-at-break of the blend is one of its main shortcomings. In this study, PP/LDPE foamed parts were fabricated by conventional injection molding (CIM) with azodicarbonamide as a chemical blowing agent (CBA) and tested for tensile properties at two test speeds. Also, the fracture surfaces of the parts were investigated by scanning electron microscopy (SEM). In addition, to investigate the underlying mechanism of the super-ductility, the tested samples were carefully analyzed and compared, and further characterized by differential scanning calorimetry and SEM. The results suggest that fabricating PP/LDPE super-ductile parts using CIM with a CBA is feasible. The results also indicate that there is a close relationship between the mechanical properties and morphological structures, which are deeply influenced by the dosage of CBA, the PP/LDPE ratio, and the packing parameters. Furthermore, compared to conventional injection molded solid parts, the ductility of the foamed parts can be dramatically improved by the formation of microfibrils in the PP phase, which come into being under certain processing conditions. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44101.
机译：聚丙烯（PP）和低密度聚乙烯（LDPE）的机械混合是一种经济，简单的方法，用于生产用于特定应用的新型聚合物材料。然而，共混物的断裂应变的降低是其主要缺点之一。在这项研究中，PP / LDPE发泡部件是通过传统的注射成型（CIM）制成的，其中偶氮二甲酰胺为化学发泡剂（CBA），并在两种测试速度下测试了拉伸性能。另外，通过扫描电子显微镜（SEM）研究部件的断裂表面。此外，为了研究超延展性的潜在机理，对测试样品进行了仔细的分析和比较，并通过差示扫描量热法和SEM对其进行了进一步表征。结果表明，使用带有CBA的CIM制造PP / LDPE超韧性零件是可行的。结果还表明，力学性能与形态结构之间存在密切的关系，而CBA的用量，PP / LDPE的比值和填充参数对它们的影响密切。此外，与常规的注塑成型固体部件相比，通过在某些加工条件下形成的PP相中的微原纤形成，可以大大提高发泡部件的延展性。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，44101。

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