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Thermo-mechanical properties of high density polyethylene with zinc oxide as a filler
Iranian Polymer Journal ( IF 3.1 ) Pub Date : 2020-02-27 , DOI: 10.1007/s13726-020-00796-7
Zainab Alsayed , Ramadan Awad , Mohamed Salem Badawi

This study investigates the microstructural, thermal, and mechanical behavior of high density polyethylene (HDPE)-based composites prepared using compression molding technique. HDPE was mixed with either micro-size zinc oxide (bulk ZnO) or zinc oxide nanoparticles (nano-ZnO) as fillers’ contents at 0, 10, 20, 30, and 40 wt%. The structural, morphological, and thermal properties of the composites were identified using X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectrophotometer (FTIR), and thermal gravimetric analysis (TGA). The results showed good dispersion and interaction mechanisms between HDPE and the fillers at low weight percentage. The thermal stability of HDPE was enhanced by adding both bulk and nano-ZnO, especially for higher filler loading. Tensile tests at different speeds and Vickers microhardness tests conducted at different indentation loads (0.25–5 N) at t = 60 s were performed to realize how the mechanical properties of the composites were influenced. The values of stiffness, ultimate tensile strength, and yield stress increased by increasing the filler loading to 20 wt% of either bulk ZnO or nano-ZnO. The values of ultimate tensile strain and ductility were deteriorated by increasing the filler loading. Nano-ZnO, at 20 wt% content in composite, showed higher mechanical properties than bulk composite, so it has been recommended for a better tensile performance at higher strain rates. Vickers microhardness measurements showed that the tested samples exhibited reverse indentation size effect (RISE) behavior. The obtained results were analyzed using Meyer’s law which was a preferred approach for analysis of HDPE/ZnO composite.

中文翻译:

以氧化锌为填充剂的高密度聚乙烯的热机械性能

这项研究调查了使用压缩成型技术制备的高密度聚乙烯(HDPE)基复合材料的微观结构,热学和机械性能。将HDPE与微米尺寸的氧化锌(本体ZnO)或氧化锌纳米颗粒(纳米ZnO)混合,以填充剂的含量为0、10、20、30和40 wt%。使用X射线衍射(XRD),扫描电子显微镜(SEM),傅立叶变换红外分光光度计(FTIR)和热重分析(TGA)来鉴定复合材料的结构,形态和热性能。结果表明,在低重量百分比下,HDPE与填料之间具有良好的分散和相互作用机理。通过同时添加块状和纳米ZnO,可以提高HDPE的热稳定性,特别是对于较高的填料含量。进行t  = 60 s,以了解如何影响复合材料的机械性能。通过将填充量增加到块状ZnO或纳米ZnO的20 wt%,可以增加刚度,极限拉伸强度和屈服应力的值。极限拉伸应变和延展性的值通过增加填料含量而降低。复合材料中含量为20 wt%的纳米ZnO具有比本体复合材料更高的机械性能,因此建议在较高的应变速率下获得更好的拉伸性能。维氏显微硬度测量表明,测试样品表现出反向压痕尺寸效应(RISE)行为。使用Meyer定律分析获得的结果,这是分析HDPE / ZnO复合材料的首选方法。
更新日期:2020-02-27
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