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首页> 外文期刊>Journal of Applied Polymer Science >Effect of UV absorbers and hindered amine light stabilizers on the photodegradation of ethylene-octene copolymer
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Effect of UV absorbers and hindered amine light stabilizers on the photodegradation of ethylene-octene copolymer

机译：紫外线吸收剂和受阻胺光稳定剂对乙烯-辛烯共聚物光降解的影响

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摘要

The photodegradation behavior of ethylene-octene copolymer (EOC) and EOC stabilized with UV stabilizers (Tinuvin 326, Chimassorb 81, Tinuvin 770 and Chimassorb 944) were investigated by the digital photography, color difference, gel content, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and mechanical tests. The results revealed that EOC exhibited a very poor photostability, whose performances were sharply reduced with increasing the irradiation time. The photodegradation products consisted of the carbonyl, hydroxyl and vinyl groups. The additives all showed an excellent photostabilizing effect, which effectively inhibited the gel formation and the chain photooxidation. The photostabilizing efficiency of these UV stabilizers could be ranked as Tinuvin 326 < Chimassorb 81 < Tinuvin 770 and Chimassorb 944. The secondary crystallization behavior was strongly affected by the annealing and chain scission. The chain scission, rather than the annealing, played a greater role in the secondary crystallization of the chain segments. And the serious chain scission could improve the mobility of the chain segments, which sharply promoted their crystallizability.
机译：通过数字摄影，色差，凝胶含量，傅里叶变换红外光谱（FTIR）研究了乙烯-辛烯共聚物（EOC）和用紫外线稳定剂（Tinuvin 326，Chimassorb 81，Tinuvin 770和Chimassorb 944）稳定的EOC的光降解行为。 ，差示扫描量热法（DSC）和机械测试。结果表明，EOC表现出非常差的光稳定性，其性能随照射时间的增加而急剧降低。光降解产物由羰基，羟基和乙烯基组成。所有添加剂均表现出优异的光稳定作用，可有效抑制凝胶的形成和链的光氧化作用。这些紫外线稳定剂的光稳定效率可以列为Tinuvin 326

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