Stabilizing effect of oxygen on the initial stages of poly(methyl methacrylate) degradation

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• 作者：Chunlei Cao ; Jie Liu ; Jianying Ma…
• 关键词：Poly(methyl methacrylate) ; Effect of oxygen ; Thermal degradation ; Nitric oxide ; Unsaturated vinyl end
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：123
• 期：2
• 页码：1459-1467
• 全文大小：1,342 KB
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• 作者单位：Chunlei Cao (1)
  Jie Liu (1)
  Jianying Ma (1)
  Zhiyong Tan (1)
  Huixuan Zhang (1) (2)
  
  1. Engineering Research Center of Synthetic Resin and Special Fiber, Ministry of Education, Changchun University of Technology, Changchun, 130012, China
  2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130012, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

The stabilizing effect of oxygen on the thermal decomposition of free radical polymerized poly(methyl methacrylate) was studied by thermogravimetric (TG/DTG) analyses. The influences of fraction of PMMA chain containing an unsaturated vinyl end on this effect of oxygen were investigated in detail to get further insight into the nature of this phenomenon. Meanwhile, the inhibiting effect of nitric oxide (NO) on the thermal decomposition of PMMA was also evaluated in order to ascertain how oxygen inhibits the thermal degradation of PMMA. The results show that both oxygen and NO have stabilizing effect on the thermal degradation of PMMA. Oxygen can entirely suppress its degradation initiated by the unsaturated vinyl end, but NO only has limited inhibiting effect on it. It was demonstrated by the limited inhibiting effect of NO that, actually, the process that oxygen inhibits the thermal degradation of PMMA is more complicated than the process that oxygen and polymer radical, generated by initiation at the unsaturated vinyl ends, combine to form a more thermal stable structure. Moreover, such process is irreversible and has nothing to do with the noticed acceleration degradation of inhibited PMMA at latter stage of degradation. Keywords Poly(methyl methacrylate) Effect of oxygen Thermal degradation Nitric oxide Unsaturated vinyl end