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首页> 外文期刊>Journal of Applied Polymer Science >Thermal degradation of electron beam crosslinked polyethylene and (ethylene-vinylacetate) blends in hot water
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Thermal degradation of electron beam crosslinked polyethylene and (ethylene-vinylacetate) blends in hot water

机译：电子束交联的聚乙烯和（乙烯-乙酸乙烯酯）共混物在热水中的热降解

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摘要

Low-density polyethylene and (ethylene-vinylacetate) blends in pure form were exposed to electron beam radiation at doses between (80-150) kGy, at room temperature, in air. Postirradiation thermal aging was done through immersing the samples in hot water at 95degreesC. Mechanical properties and changes in chemical structure were determined after 1500 h. Accelerated oven aging test was carried out on thin films after immersing them in hot water for 1000 h. Heat aging treatment showed that the blends have a convenient thermal stability compared to polyethylene. Although elongation at break and tensile strength de-creased after heat aging procedure, obviously, this reduction was lower in blended samples than that of pure PE. In all samples, hydroxyl and transvinylene unsaturated end groups were formed during heat aging in hot water. Formation of these groups was less in blends at doses between 80-100 kGy, but was higher at 150 kGy than pure polyethylene. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2346-2352, 2003. [References: 19]
机译：将纯净形式的低密度聚乙烯和（乙烯-乙酸乙烯酯）共混物在室温下于空气中以（80-150）kGy的剂量暴露于电子束辐射下。辐照后的热老化是通过将样品浸入95摄氏度的热水中完成的。在1500小时后测定机械性能和化学结构的变化。将薄膜浸入热水中1000 h后，对薄膜进行加速烤箱老化测试。加热老化处理表明，与聚乙烯相比，共混物具有便利的热稳定性。尽管热老化后断裂伸长率和抗拉强度降低，但显然，混合样品中的这种降低低于纯PE。在所有样品中，在热水中热老化过程中均形成了羟基和不饱和乙烯基端基。在80-100 kGy之间的掺混物中，这些基团的形成较少，但在150 kGy处的掺混率高于纯聚乙烯。 （C）2003 Wiley Periodicals，Inc. J Appl Polym Sci 89：2346-2352，2003。[参考：19]

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