Cyclization mechanism and kinetics of poly(acrylonitrile-co-2-acrylamido-2-methylpropane sulfonic acid) copolymer investigated by FTIR spectroscopy
Autor: | Guang Yang, Chi Jiang, Caizhen Zhu, Mingliang Wang, Jiali Yu, Zhipeng He, Jian Xu, Muwei Ji, Huichao Liu |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Materials science
Polymers and Plastics Polyacrylonitrile copolymer Kinetics 02 engineering and technology 2-Acrylamido-2-methylpropane sulfonic acid Sulfonic acid 010402 general chemistry 01 natural sciences Radical cyclization Autocatalysis chemistry.chemical_compound Polymer chemistry Copolymer Polymers and polymer manufacture chemistry.chemical_classification Comonomer Organic Chemistry Two-dimensional correlation analysis technique 021001 nanoscience & nanotechnology 0104 chemical sciences FTIR spectroscopy TP1080-1185 chemistry Cyclization kinetics Carbon fiber Acrylonitrile 0210 nano-technology Cyclization mechanism |
Zdroj: | Polymer Testing, Vol 93, Iss, Pp 106969-(2021) |
ISSN: | 0142-9418 |
Popis: | Cyclization reaction of poly(acrylonitrile-co-2-acrylamido-2-methylpropane sulfonic acid) [P(AN-co-AMPS)] copolymer during thermal oxidative stabilization (TOS) process was investigated by FTIR and two dimensional (2D) correlation analysis technique. The results showed the mechanism of cyclization reaction at different temperatures were varying. At 200 °C, the cyclization reactions generated by autocatalytic cyclization mechanism. While at higher temperatures, the cyclization reactions took place through ionic cyclization mechanism and free radical cyclization mechanism. The AMPS comonomer could reduce the heat release of cyclization reactions and improve the stability at 200 and 230 °C. At higher temperatures, the cyclization reactions were facilitated rapidly. However, the oxidation and degradation reactions were also intense, which will cause the molecular chain to break and defects in the final carbon fibers (CFs). This research has theoretical guiding significance for the optimization of heat treatment conditions for PAN copolymers used as CFs. |
Databáze: | OpenAIRE |
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