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Impact of compression molding conditions on the thermal and mechanical properties of polyethylene

机译：压缩成型条件对聚乙烯热和力学性能的影响

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Compression molding is a current technique in polymer processing. Despite numerous studies, effect of molding pressure on physical properties has surprisingly not been fully investigated. In this study, the thermal and mechanical behavior of the compression-molded polyethylene were thus explored to better grasp the relationship between processing parameters and ensuing properties. The effect of the molding temperature, pressure, cooling rate, and temperature profile on the tensile and flexural moduli as well as melting point of polyethylene was studied. We conclude that higher tensile and flexural moduli are obtained by increasing pressure and molding temperature, as well as decreasing the cooling rate. Our results were corroborated by X-ray diffraction and differential scanning calorimetry measurements. Moreover, the use of a temperature gradient with different temperatures for the upper and bottom plates of the mold leads to asymmetric samples whose tensile and flexural moduli are improved. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46176.
机译：压缩成型是聚合物加工的电流技术。尽管有许多研究，但模塑压力对物理性质的影响令人惊讶地没有得到充分调查。在该研究中，因此探讨了压缩模塑聚乙烯的热和力学行为，以更好地掌握处理参数和随后性能之间的关系。研究了模塑温度，压力，冷却速度和温度曲线在拉伸和弯曲模量上的影响以及聚乙烯的熔点。我们得出结论，通过增加压力和模塑温度，以及降低冷却速度来获得更高的拉伸和弯曲模量。我们的结果是通过X射线衍射和差示扫描量热测量来证实的。此外，使用模具的上部和底板的不同温度的温度梯度导致其拉伸和弯曲模量的不对称样品。 （c）2017 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,46176。

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