Lifetime prediction of polymers requires accelerated ageing based on an increase in UV light intensity and temperature. However, the representativeness of artificial ageing is still an issue. The relevance of highly accelerated UV-induced weathering raises the question of reciprocity failure depending on the polymer. The influences of irradiance and temperature on the photooxidation kinetics of polyethylene were studied to determine the extent to which increasing light intensity leads to accelerated photooxidation of polyethylene. Polyethylene films were subjected to accelerated photooxidative experiments at various UV light intensities and different temperatures, and the amounts of carbonylated photoproducts were monitored by IR spectroscopy. The results show reciprocity failure for polyethylene photooxidation and the limits of acceleration by UV light.

预测聚合物的寿命需要根据紫外线强度和温度的升高来加速老化。但是，人工时效的代表性仍然是一个问题。高度加速的紫外线引起的风化的相关性提出了取决于聚合物的互易失效的问题。研究了辐照度和温度对聚乙烯光氧化动力学的影响，以确定增加的光强度导致聚乙烯加速光氧化的程度。在各种紫外线强度和不同温度下对聚乙烯薄膜进行加速的光氧化实验，并通过红外光谱法监测羰基化光产物的量。