کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1408808 | 1501699 | 2016 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: ATR-FTIR spectroscopy study of the photodegradation protective properties of BP-4 and 4HBP in polyvinyl acetate thin films ATR-FTIR spectroscopy study of the photodegradation protective properties of BP-4 and 4HBP in polyvinyl acetate thin films](/preview/png/1408808.png)
• The photostability of two UV absorbers added in polyvinyl acetate films was studied.
• Photodegradation of PVAc films was studied in inert and real conditions.
• ATR-FTIR was used for quantitative and qualitative analysis of degradation products.
• Photodegradation pathways for studied films were proposed.
In this paper the protective properties of 4HBP (4-hydroxybenzophenone) and BP-4 (5-benzoyl-2-hydroxy-4-methoxybenzenesulfonic acid) in polyvinyl acetate thin films have been studied. UV-irradiation on the films was applied in real humidity and inert atmosphere for 1, 2 and 4 h accelerated weathering. ATR-FTIR and UV-VIS spectroscopies have been used for qualitative and quantitative estimation of photodepletion of the UV-absorbers and photostability of polyvinyl acetate films. Both UV-absorbers have demonstrated good protective properties in inert atmosphere compared to real humidity. The mechanisms of photochemical reactions of 4HBP (4-hydroxybenzophenone) and BP-4 (5-benzoyl-2-hydroxy-4-methoxybenzenesulfonic acid) were attributed to photoenolization of carbonyl and hydroxyl groups. The experimental results demonstrated that 4HBP (4-hydroxybenzophenone) has higher protective properties than BP-4 (5-benzoyl-2-hydroxy-4-methoxybenzenesulfonic acid). The photodegradation mechanisms of polyvinyl acetate films in inert atmosphere and real humidity were assigned based on the Norrish type I and II reactions.
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Journal: Journal of Molecular Structure - Volume 1118, 15 August 2016, Pages 184–193