交联聚乙烯的光降解

Polymer Photochemistry Pub Date : 1986-01-01 DOI:10.1016/0144-2880(86)90035-7

Ayako Torikai, Sachiko Asada, Kenji Fueki

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引用次数: 14

摘要

利用紫外光谱(UV)和傅里叶变换红外光谱(FT-IR)技术以及凝胶和密度测量研究了交联聚乙烯的光降解。在γ辐照聚乙烯中观察到二烯型化合物的形成以及凝胶的形成。通过观察氧化和乙烯基的形成以及凝胶分数的变化来估计光降解效率。交联聚乙烯的光降解可能由γ辐照形成的二烯型化合物吸收光子引起。交联聚乙烯的光氧化和断链速率比未交联聚乙烯快。根据实验结果，提出了一种γ-辐照交联聚乙烯的光降解机理。

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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Photodegradation of crosslinked polyethylene

The photodegradation of crosslinked polyethylene has been studied by ultraviolet (UV) and Fourier transform infrared (FT-IR) spectroscopic techniques and by gel and density measurements. The formation of the diene-type compound as well as of the gel was observed in γ-irradiated polyethylene. The efficiency of photodegradation was estimated from the oxygenated and vinyl group formation observed, and by the change of gel fraction. The photodegradation of crosslinked polyethylene may be initiated by the absorption of a photon by diene-type compounds formed by γ-irradiation. The rate of photo-oxidation and chain scission is faster in crosslinked polyethylene than in uncrosslinked polymer. A photodegradation mechanism for polyethylene crosslinked by γ-irradiation is proposed on the basis of the experimental results.

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