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Investigation of the Cyclization Mechanism of Poly(acrylonitrile-co-ethylenesulfonic acid) Copolymer during Thermal Oxidative Stabilization by In Situ Infrared Spectroscopy
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-05-05 , DOI: 10.1021/acs.iecr.0c00977
Zhipeng He 1 , Huichao Liu 1 , Shuo Zhang 1 , Jinglong Yang 1 , Chi Jiang 1 , Muwei Ji 1 , Jiali Yu 1 , Mingliang Wang 1 , Caizhen Zhu 1 , Jian Xu 1
Affiliation  

Cyclization reaction is a crucial step during the heat treatment process of polyacrylonitrile (PAN)-based carbon fibers (CFs). In this work, in situ infrared spectroscopy and two-dimensional (2D) correlation spectroscopy are employed for the investigation of the cyclization mechanisms of PAN and poly(acrylonitrile-co-ethylenesulfonic acid) [P(AN-co-ESA)] copolymer during different temperature treatments under air atmosphere. The cyclization reaction of PAN was promoted by an acknowledged free radical mechanism. The cyclization reaction of P(AN-co-ESA) copolymer was promoted by an autocatalytic cyclization mechanism. A key step during this process was that the association structures generated by the interaction of hydrogen bond under heat treatment and the bond of S═O change before the cyclization structures composed of C═C and C═N bonds. The new insight about the cyclization mechanism of P(AN-co-ESA) copolymer was verified by Fourier transform infrared spectroscopy and 2D correlation analysis. It is useful for further studies of the comonomer in PAN copolymers as a precursor of CFs.

中文翻译:

聚(丙烯腈的环化机理的研究由-ethylenesulfonic酸)热氧化稳定期间共聚物原位红外光谱

环化反应是聚丙烯腈(PAN)基碳纤维(CFs)热处理过程中的关键步骤。在这项工作中,原位红外光谱和二维(2D)相关光谱用于研究PAN和聚(丙烯腈-共-乙烯磺酸)[P(AN--ESA)]共聚物在反应过程中的环化机理。在空气气氛下进行不同的温度处理。PAN的环化反应通过公认的自由基机制促进。P(AN- co的环化反应-ESA)共聚物通过自催化环化机理得到促进。该过程中的关键步骤是,在由C═C和C═N键组成的环化结构之前,热处理条件下氢键与S═O键的相互作用产生的缔合结构发生变化。通过傅立叶变换红外光谱和二维相关分析,验证了对P(AN- co- ESA)共聚物环化机理的新见解。对于进一步研究作为CFs的PAN共聚物中的共聚单体很有用。
更新日期:2020-05-05
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