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Comprehensive and quantitative study on the thermal oxidative stabilization reactions in poly(acrylonitrile-co-itaconic acid) copolymer

机译:聚(丙烯腈 - 共衣酸)共聚物中热氧化稳定反应的综合和定量研究

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摘要

Thermal oxidative stabilization (TOS) reactions, mainly cyclization, oxygen uptake, dehydrogenation, crosslinking, and disproportionation termination of cyclization in poly(acrylonitrile-co-itaconic acid) (PAI), are tracked quantitatively by the combination of second-derivative and cure-fitting operations in the Fourier transform infrared spectroscopy spectra (FTIR) range of 1800-1000 cm(-1) and 2300-2100 cm(-1). Except the cyclization and disproportionation of cyclization are chemical-reaction-controlled process, the other three reactions are both diffusion-controlled and chemical-reaction-controlled processes. The formation of free and conjugated carbonyl group need the optimal cyclization rate, adequate unreacted linear PAI chains, and appropriate oxidation ability coordinated. The higher temperature, the faster rate and the higher extent of the cyclization and the crosslinking reactions as well as the faster disproportionation termination of cyclization. The length of the formed cyclic structures became shorter as the evolution of TOS process, especially for 265 degrees C. The crosslinking, oxygen uptake, dehydrogenation, and termination of cyclization reactions become dominant with the proceeding of TOS process, especially as the cyclization extent above 0.8 and at high temperature such as 265 degrees C. (C) 2017 Wiley Periodicals, Inc.
机译:热氧化稳定(TOS)的反应,主要是环化,氧摄取,脱氢,交联,并在聚环化歧化终止(丙烯腈 - 共 - 衣康酸)(PAI),是由第二衍生物和固化物的组合定量跟踪在傅立叶合操作变换的1800至1000年厘米(-1)和2100至00年厘米(-1)的红外分光光谱(FTIR)的范围。除了上述环化和环化的歧化是化学反应控制的过程中,其他三个反应都是扩散控制和化学反应控制的流程。的游离和缀合的羰基需要形成最佳的环化率,未反应的充足线性PAI链,和适当的氧化能力协调。较高的温度,在更快的速率和环化的较高程度和交联反应,以及环化反应的速度更快歧化终止。所形成的环状结构的长度变得像TOS过程的演变较短,特别是对265℃下交联,摄氧量,脱氢,和环化反应的终止成为主导与TOS过程的进行,尤其是作为环化程度以上0.8并在高温下,如265℃。(C)2017年威利期刊公司

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  • 来源
    《Journal of Applied Polymer Science》 |2018年第10期|共8页
  • 作者单位

    Changchun Univ Technol Sch Chem Engn Minist Educ Engn Res Ctr Synthet Resin &

    Special Fiber Changchun 130012 Jilin Peoples R China;

    Changchun Univ Technol Sch Chem Engn Minist Educ Engn Res Ctr Synthet Resin &

    Special Fiber Changchun 130012 Jilin Peoples R China;

    Changchun Univ Technol Sch Chem Engn Minist Educ Engn Res Ctr Synthet Resin &

    Special Fiber Changchun 130012 Jilin Peoples R China;

    Changchun Univ Technol Sch Chem Engn Minist Educ Engn Res Ctr Synthet Resin &

    Special Fiber Changchun 130012 Jilin Peoples R China;

    Changchun Univ Technol Sch Chem Engn Minist Educ Engn Res Ctr Synthet Resin &

    Special Fiber Changchun 130012 Jilin Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高分子化合物工业(高聚物工业);
  • 关键词

    crosslinking; degradation; films; spectroscopy;

    机译:交联;降解;薄膜;光谱;

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