Polystyrene photodegradation with a novel TiO2/poly(ethylene oxide)/methyl linoleate paint photocatalyst
Polystyrene photodegradation with a novel TiO2/poly(ethylene oxide)/methyl linoleate paint photocatalyst
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新型 TiO2/聚环氧乙烷/亚油酸甲酯涂料光催化剂的聚苯乙烯光降解
DOI：
10.1002/app.39101
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
K. Miyazaki
中科院分区：
文献类型：
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作者：
H. Nakatani;K. Miyazaki
采用二氧化钛（TiO 2）/聚环氧乙烷（PEO）/亚油酸甲酯（ML）光催化体系对聚苯乙烯（PS）薄膜进行光降解。PS表面被TiO 2/PEO组分催化光降解，并产生部分共轭碳-碳双键。PS的碳碳双键与自由基发生交联反应，阻止了光降解向内部扩散。另外的ML组分确实阻断了交联反应并加速了光降解速率。TiO 2/PEO/ML涂料的4-h-光降解膜的分子量小于10，000的分数为15.1%，其光降解产率比TiO 2/PEO涂料的光降解产率提高了4倍。光降解PS部分的重量损失值分别为9.9，10.7，和11.7%，在4，8，和12小时，分别，并逐渐增加，随着照射时间的增加。涂料对部分膜层有强烈的光降解作用，且光催化效果持续。ML被接枝聚合到膜中，并且引起相分离。0.05 mm和0.1 mm薄膜的光降解行为明显不同;这表明ML自由基的扩散受到薄膜厚度的影响。© 2013 Wiley Periodicals，Inc. J.应用聚合物科学，2013
The photodegradation of a polystyrene (PS) film was performed by a titanium dioxide (TiO2)/poly(ethylene oxide) (PEO)/methyl linoleate (ML) paint photocatalyst system. The PS surface was catalytically photodegraded by the TiO2/PEO component, and a conjugated carbon–carbon double bond was partially produced. A crosslinking reaction occurred between the PS carbon–carbon double bond and radical spices; as a result, the photodegradation diffusion into the inner region was blocked. The additional ML component certainly blocked the crosslinking reaction and accelerated the photodegradation rate. The fraction of less than 10,000 molecular weight of the 4‐h‐photodegaraded film with the TiO2/PEO/ML paint was 15.1%, and its photodegradation yield increased four times compared with that with the TiO2/PEO one. The weight loss values of the photodegraded PS part were 9.9, 10.7, and 11.7% at 4, 8, and 12 h, respectively, and gradually increased with increasing irradiation time. Some part of the film was violently photodegraded by the paint, and its photocatalytic effect lasted. The ML was graft‐polymerized into the film, and a phase separation was caused. The photodegradation behavior between the 0.05‐ and 0.1‐mm films was remarkably different; this showed that the diffusion of the ML radical was affected by the film thickness. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013