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Analysis of the foaming mechanisms of materials based on high-density polyethylene (HDPE) crosslinked with different irradiation doses

机译:基于高密度聚乙烯(HDPE)交联用不同照射剂量的材料的发泡机制分析

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Different crosslinked high-density polyethylene based cellular polymers have been produced by a free foaming process using a chemical blowing agent. The polymer matrix was crosslinked by electron beam irradiation using different doses ranging from 25 to 175 kGy. The main aim of this work is to study the effect of the different irradiation doses on the density, cellular structure, and foaming mechanisms. Results show that irradiation doses as high as 175 kGy have to be used to obtain cellular materials with a low relative density (0.06), cell sizes of around 50 m, and cell densities of 1.6 x 10(7) cellscm(-3). The strain hardening of the polymer matrix increases with the irradiation dose leading to an increase of the polymer resistance to be stretched, which helps to avoid undesirable cellular degeneration processes. Irradiation doses lower than 175 kGy are not able to stabilize the cellular structure leading to foams with relative densities higher than 0.1 and degenerated cellular structures. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46276.
机译:通过使用化学发泡剂的自由发泡方法生产不同的交联高密度聚乙烯基细胞聚合物。聚合物基质通过电子束照射使用25至175 kgy的不同剂量交联。这项工作的主要目的是研究不同辐射剂量对密度,细胞结构和发泡机制的影响。结果表明,高达175 kgy的照射剂量必须用于获得具有低相对密度(0.06)的细胞材料,约50μm,细胞密度为1.6×10(7)Cellscm(-3)。聚合物基质的应变硬化随着辐射剂量的增加,导致待拉伸的聚合物耐药性增加,有助于避免不希望的细胞变性过程。低于175 kgy的辐照剂量不能稳定蜂窝结构,导致具有高于0.1和退化细胞结构的相对密度的泡沫。 (c)2018 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2018,135,46276。

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