目的：研究不同试验方式下聚碳酸酯的光老化行为。方法对比聚碳酸酯在自然暴露试验、自然加速光老化试验及实验室光源暴露试验中的缺口冲击强度变化，分析各种加速试验方式对自然暴露试验的模拟性。结果聚碳酸酯在拉萨户外自然暴露中，其缺口冲击强度随试验时间的延长而降低。单轴跟踪暴露和跟踪太阳反射聚能暴露这两种自然加速光老化试验方式对户外自然暴露的模拟性均较好，加速倍率分别约为1.5，6。氙弧灯下的暴露试验对自然暴露试验的模拟性比紫外冷荧灯、金属卤素灯高。结论跟踪太阳反射聚能暴露、氙弧灯下暴露可推荐为评价聚碳酸酯光老化行为的加速试验方式。%Objective To study the photo-oxidation aging behaviors of polycarbonate under various test conditions. Methods The impact strength changes of polycarbonate in outdoor exposure test, natural accelerated exposure test and test of exposure to laboratory light sources were contrasted. The simulation performances of various accelerated exposure tests for outdoor exposure test were analyzed respectively. Results The impact strength of polycarbonate reduced with prolonging test time in outdoor exposure test at Lhasa test station. The simulation performance of both sun tracking exposure test and natural sunlight concentrated exposure test for outdoor exposure test was good, while the acceleration factors of these two natural accelerated exposure tests were 1.5 and 6, respectively. The simulation performance of test of exposure to Xenon-arc sources for outdoor exposure test was better than that of the test of exposure to fluorescent UV lamps or metal halide lamps. Conclusion The recommended accelerated test conditions for evaluating photo-oxidation aging behaviors of polycarbonate was natural sunlight concentrated exposure test or test of exposure to Xenon-arc sources.
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