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首页> 外文期刊>Journal of Applied Polymer Science >INVESTIGATION OF RADIATION-CROSSLINKED FOAM OF LDPE/EVA BLENDS
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INVESTIGATION OF RADIATION-CROSSLINKED FOAM OF LDPE/EVA BLENDS

机译：LDPE / EVA共混物辐射交联泡沫的研究

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摘要

Low-density polyethylene/ethylene-vinyl acetate copolymer (LDPE/EVA) blend was irradiated by gamma-ray and then expanded by heat as a foamed material. The EVA content in the LDPE/EVA blend was benefited to form a gel. The gel fraction of the irradiated LDPE/EVA blend increased with the increasing of its EVA content in a given dose. The gel fraction values of LDPE/EVA blend with 30% EVA content were higher than those of other blends in a same given dose; its gel fraction value was 1.7 times as those values of the LDPE without EVA. The gel fractions of the LDPE/EVA blend were increased with radiation dose in oxygen, in air, and in nitrogen, and the formation of gel was limited by oxygen. The oxidation products of the foam of the LDPE/EVA blend were observed in nitrogen, in air, and in oxygen by Fourier transform IR spectra. The LDPE/EVA blend system has no protection effect from oxidation in comparison with the LDPE system without EVA, which has less oxidation product than those without EVA in a same given gel fraction. The gel fraction of the LDPE/EVA blend around 25-35%, radiation dose 25 +/- 5 kGy, irradiated by gamma-ray in air or in nitrogen, with higher expansion ratio (19), smaller cell diameter (0.175 mm), lower apparent density (0.042 g/cm(3)), higher tensile strength (0.40 MPa), and longer elongation at break (290-360%) foam of the LDPE/EVA blend were selected. These were optimum conditions for application in this system. The relations among gel fraction of the LDPE/EVA blend, expansion ratio, apparent density, average cell diameter, and mechanical properties of the foam were discussed. (C) 1996 John Wiley & Sons, Inc. [References: 8]
机译：低密度聚乙烯/乙烯-乙酸乙烯酯共聚物（LDPE / EVA）共混物用伽玛射线辐照，然后通过加热膨胀为泡沫材料。 LDPE / EVA共混物中的EVA含量有利于形成凝胶。在给定剂量下，经辐照的LDPE / EVA共混物的凝胶分数随其EVA含量的增加而增加。在相同给定剂量下，EVA含量为30％的LDPE / EVA共混物的凝胶分数值高于其他共混物。它的凝胶分数是没有EVA的LDPE的1.7倍。 LDPE / EVA共混物的凝胶分数随氧气，空气和氮气中辐射剂量的增加而增加，并且凝胶的形成受到氧气的限制。通过傅立叶变换红外光谱在氮气，空气和氧气中观察到LDPE / EVA共混物泡沫的氧化产物。与没有EVA的LDPE系统相比，LDPE / EVA共混体系没有氧化保护作用，在相同的给定凝胶分数下，该产品的氧化产物比没有EVA的LDPE系统少。 LDPE / EVA共混物的凝胶分数约为25-35％，辐射剂量为25 +/- 5 kGy，在空气或氮气中被伽马射线辐照，具有较高的膨胀比（19），较小的泡孔直径（0.175 mm） ，LDPE / EVA共混物的泡沫的表观密度较低（0.042 g / cm（3）），拉伸强度较高（0.40 MPa）和断裂伸长率较高（290-360％）。这些是在该系统中应用的最佳条件。讨论了LDPE / EVA共混物的凝胶分数，膨胀比，表观密度，平均泡孔直径和泡沫塑料力学性能之间的关系。 （C）1996 John Wiley＆Sons，Inc. [参考：8]

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