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合成了含稳态氮氧自由基的光稳定剂,其结构通过ESR、元素分析表征,考察了其热稳定性。将其与聚乙烯 (PE)／乙烯-醋酸乙烯酯共聚物(EVA)共混吹塑薄膜,经过紫外灯照射进行加速老化后,考察该含氮氧自由基的光稳定剂的光稳定性能,对比了不同试样老化前后的力学性能、羰基指数和透光率的变化。结果表明:含稳态氮氧自由基的光稳定剂在367℃才开始迅速分解,热稳定性良好,能够满足成型加工的各项要求;添加含稳态氮氧自由基光稳定剂的PE／EVA薄膜经过紫外光照射后的力学性能明显优于没有添加任何光稳定剂的和添加了同样用量的Chimassorb 944的PE／EVA薄膜;透光率衰减的速率与加入Chimassorb 944的薄膜透光率衰减速率几乎一样,但是透光率要高于添加Chimassorb 944的薄膜。
The photostabilizers with stable nitroxide radical were synthesized and their structures were characterized by ESR and elemental analysis. The thermal stability was investigated. After blending with polyethylene (PE) / ethylene-vinyl acetate copolymer (EVA), the blown film was accelerated and irradiated with ultraviolet light to accelerate aging. Then the light stability of the light stabilizer containing nitrogen oxide was investigated. The mechanical properties, carbonyl index and transmittance of different samples before and after aging were compared. The results showed that the photostabilizer with steady-state nitroxide radical started to decompose rapidly at 367 ℃, and its thermal stability was good. It could meet the various requirements of molding processing. The mechanical properties of EVA film after UV irradiation are obviously better than that of PE / EVA film without adding any light stabilizer and the same amount of Chimassorb 944; the rate of light attenuation is similar to that of film with Chimassorb 944 The rate is almost the same, but the transmittance is higher than the Chimassorb 944 film.