Consideration of roles of commercial TiO2 pigments in aromatic polyurethane coating via the photodegradation of dimethyl toluene-2,4-dicarbamate in non-aqueous solution

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• 作者：Shuolin Zhou ; Qiong Xu ; Jiafu Xiao ; Wenzhou Zhong…
• 关键词：Titanium dioxide pigment ; Polyurethane ; Dimethyl toluene ; 2 ; 4 ; dicarbamate ; Photodegradation ; Mechanism
• 刊名：Research on Chemical Intermediates
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：41
• 期：10
• 页码：7785-7797
• 全文大小：740 KB
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• 作者单位：Shuolin Zhou (1)
  Qiong Xu (1)
  Jiafu Xiao (1)
  Wenzhou Zhong (1)
  Ningya Yu (1)
  Steven Robert Kirk (1)
  Tao Shu (1)
  Dulin Yin (1)
  
  1. National and Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, Key Laboratory of Resource Fine-Processing and Advanced Materials of Hunan Province and Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, 410081, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1568-5675

文摘

Dimethyl toluene-2,4-dicarbamate (2,4-TDC) was selected as a model compound for aromatic polyurethane to investigate the photo-chemical behavior of commercial TiO₂ pigments in non-aqueous solution. The UV–Visible spectrometry analysis results showed that the UV-shielding ability of the rutile TiO₂ pigment was better than that of the anatase TiO₂ pigment. Photodegradation experiments suggested that the photodegradation of 2,4-TDC was retarded by rutile TiO₂ pigment, while accelerated by anatase TiO₂ pigment. With the help of the degradation intermediates during the photodegradation process and calculated data, such as point charges and bond length, the preliminary photodegradation mechanism of 2,4-TDC was also briefly elucidated, including the addition of hydroxyl radicals and the cleavage of the carbamate side chain. Additionally, the photodegradation of 2,4-TDC was used to evaluate the photoreactivity of TiO₂ pigments, this is proved to an efficient approach with potential application in industry. Keywords Titanium dioxide pigment Polyurethane Dimethyl toluene-2,4-dicarbamate Photodegradation Mechanism