Photodegradation of polyethylene: Effect of crosslinking on the oxygenated products and mechanical properties

Polymer Photochemistry Pub Date : 1986-01-01 DOI:10.1016/0144-2880(86)90027-8

Ayako Torikai , Ataru Takeuchi , Shigeo Nagaya , Kenji Fueki

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引用次数: 39

Abstract

The photodegradation of three types of polyethylene has been studied by electron spin resonance (ESR), ultraviolet absorption (UV), Fourier transform infrared absorption (FTIR), gel fraction and mechanical properties measurements.

Various types of oxygenated products were detected by FTIR spectrometry in photoirradiated polyethylene. The rate of formation of oxygenated products is greater in the case of photoirradiated crosslinked polyethylene. A detailed photodegradation mechanism for polyethylene is proposed on the basis of the experimental results.

Tensile tests on photoirradiated polyethylene were also carried out. It was found that crosslinking improved the photostability of polyethylene. The relationship between the amount of oxidation products produced and the decrease of mechanical strength gives a measure of the photostability of polyethylene. We have tried to correlate the carbonyl content with the mechanical properties to predict the photostability of the polymer.

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聚乙烯的光降解:交联对氧化产物和力学性能的影响

采用电子自旋共振(ESR)、紫外吸收(UV)、傅里叶变换红外吸收(FTIR)、凝胶分数和力学性能测试等方法研究了三种聚乙烯的光降解过程。用FTIR光谱法测定了光辐照聚乙烯中的各种氧合产物。在光照射交联聚乙烯的情况下，氧合产物的形成速率更大。在实验结果的基础上，提出了聚乙烯的光降解机理。对光辐照聚乙烯进行了拉伸试验。发现交联提高了聚乙烯的光稳定性。产生的氧化产物的数量与机械强度的下降之间的关系给出了聚乙烯光稳定性的度量。我们试图将羰基含量与力学性能联系起来，以预测聚合物的光稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymer Photochemistry

CiteScore

1.20

自引率

0.00%

发文量