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首页> 外文期刊>Journal of Applied Polymer Science >Effect of molecular weight of polyethylene on its flammability
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Effect of molecular weight of polyethylene on its flammability

机译：聚乙烯分子量对其可燃性的影响

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摘要

Polyethylene has been widely applied in our society and is known to burn well. Many researchers have been studying to control the flammability of polyethylene when adding several catalysts. However, this study has confirmed the effect of the molecular weight on the flammability of polyethylene. This article displays combustion states of two different molecular weights of polyethylene. The low molecular weight of polyethylene did not ignite and the high molecular weight of polyethylene ignited and burned well. From this result, it was difficult for polyethylene to continue combustion under limited conditions, such as the vertical configuration of the materials, air circumstance, and low molecular weight. To analyze such behaviors, the relationship between combustion state and degradation behavior of polyethylene was compared to that of polypropylene (PP) and polystyrene. PP and polystyrene decomposed into small molecules directly through chain-end scission and that low-molecular weight scission products went to gas phase and reacted with oxygen and consequently fire around specimens during combustion. Polyethylene decomposed into relatively higher molecular weight scission products through random scission at primary degradation. The scission products further decomposed into lower molecular weight products with drip, which caused the combustion under specimens. There were no big differences in a weight loss temperature and scission products at high temperature between a low molecular weight of polyethylene and a high molecular weight of polyethylene. Therefore, the degradation and combustion behavior of scission products of polyethylene in primary degradation warrant further research on flame retardant of polyethylene.
机译：聚乙烯已在我们的社会中得到广泛应用，并且燃烧良好。当添加几种催化剂时，许多研究人员一直在研究控制聚乙烯的可燃性。但是，该研究已经证实分子量对聚乙烯可燃性的影响。本文显示了两种不同分子量的聚乙烯的燃烧状态。聚乙烯的低分子量未点燃，聚乙烯的高分子量点燃并燃烧良好。根据该结果，聚乙烯难以在有限的条件下继续燃烧，例如材料的垂直构型，空气环境和低分子量。为了分析这种行为，比较了聚乙烯与聚丙烯（PP）和聚苯乙烯的燃烧状态与降解行为之间的关系。 PP和聚苯乙烯直接通过链断裂而分解成小分子，低分子量的断裂产物进入气相并与氧气反应，因此在燃烧过程中在样品周围着火。聚乙烯在一次降解时通过随机断裂而分解为相对较高分子量的断裂产物。分裂产物进一步滴加分解为低分子量产物，这导致样品燃烧。在聚乙烯的低分子量和聚乙烯的高分子量之间，高温下的减肥温度和分裂产物没有很大差异。因此，聚乙烯分解产物在一次降解中的降解和燃烧行为值得进一步研究聚乙烯的阻燃性。

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