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首页> 外文期刊>Polymer Degradation and Stability >A study on thermal oxidation mechanism of styrene-butadiene-styrene block copolymer (SBS)
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A study on thermal oxidation mechanism of styrene-butadiene-styrene block copolymer (SBS)

机译:苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)的热氧化机理研究

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The thermal oxidation process of SBS was studied by in situ FTIR and programming heating up DSC. The thermal oxidation mechanism of SBS was analyzed according to the activation energy and pre-exponential factor calculated by Friedman method. The results show that the oxidation of SBS is mainly on butadiene blocks. It is a self-catalyzed reaction containing four steps. The first step is the initiation of chain by free radical. The second is the growth and decomposition of polymer chain. The third is the formation of anhydride coming from dehydrated carbonyl. The fourth is the annihilation of active centers. Antioxidant which provides H atom easily can annihilate active free radical to protect SBS from thermal oxidation at lower temperature. (C) 2007 Elsevier Ltd. All rights reserved.
机译:通过原位FTIR和编程加热DSC研究了SBS的热氧化过程。根据Friedman方法计算的活化能和指数前因子分析了SBS的热氧化机理。结果表明:SBS的氧化主要发生在丁二烯嵌段上。它是一种包含四个步骤的自催化反应。第一步是自由基启动链。二是聚合物链的生长和分解。第三种是脱水羰基酸酐的形成。第四是歼灭活跃的中心。易于提供H原子的抗氧剂可以湮灭活性自由基,以保护SBS在较低温度下免受热氧化。(C) 2007 爱思唯尔有限公司保留所有权利。

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