INFRARED STUDY OF OXYGENATED GROUPS FORMED IN POLYETHYLENE DURING OXIDATION
INFRARED STUDY OF OXYGENATED GROUPS FORMED IN POLYETHYLENE DURING OXIDATION
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DOI：
10.1002/pol.1960.1204213916
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发表时间：
1960-01-01
影响因子：
3.4
通讯作者：
LUONGO, JP
中科院分区：
文献类型：
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作者：
LUONGO, JP
研究了聚乙烯在氧化过程中分子结构的变化。目前公认的理论涉及一个自由基过程，并且主要基于与模型化合物的反应动力学的测量。红外光谱为跟踪氧化反应过程提供了另一种方法。通过记录氧化过程中聚乙烯样品的红外光谱，可以连续跟踪各种含氧基团的形成。在氧化的早期阶段，注意到了过氧化氢的形成，以及随后它们分解成主要的二次氧化产物。发现在自催化氧化开始后，α碳非常容易受到氧气的攻击，并由此观察到亚甲基含量的下降。这些结果描述了在氧化和载体的初始阶段形成的含氧分子基团，并拓宽了目前公认的聚乙烯氧化降解的机理。
The changes in the molecular structure of polyethylene during oxidation are studied. The presently accepted theory involves a free‐radical process and is based largely on measurements of reaction kinetics with model compounds. Infrared spectroscopy afford an alternate method of following the course of the oxidation reaction. By recording the infrared spectra of polyethylene samples during oxidation, it was possible to follow continuously the formation of various oxygen‐containing groups. During the early stages of oxidation, the formation of hydroperoxides was noted, as was their subsequent decomposition into the predominant secondary oxidation products. The alpha carbon was found to be quite susceptible to oxygen attack after autocatalytic oxidation had begun, and a resulting decrease in methylene content was observed. The results provide a description of the oxygenated molecular groups that form during the initial stages of oxidation and support and broaden the presently accepted mechanism for the oxidative degradation in polyethylene.