Kinetics of fast-curing epoxy resin cationic thermopolymerization: Propagated by ACE and AM mechanism

The kinetics of fast thermal curing epoxy resin and the fast-curing ability initiated by 4- hydroxyphenyl dialkyl sulfonium salt cationic curing agent were discussed. The curing reaction is driven by two chain propagation mechanisms. At the initial stage of the polymerization, the propagation is dom...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2022-11, Vol.147 (21), p.11899-11907
Main Authors: Li, Bingxuan, Chen, Jiangcong, Wang, Haoyuan, Li, Hengfeng
Format: Article
Language:English
Subjects:
Activation energy
Analytical Chemistry
Cations
Chemistry
Chemistry and Materials Science
Curing agents
Epoxy resins
Inorganic Chemistry
Kinetics
Measurement Science and Instrumentation
Physical Chemistry
Polymer Sciences
Polymerization
Propagation (polymerization)
Sulfonium salts
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Summary:The kinetics of fast thermal curing epoxy resin and the fast-curing ability initiated by 4- hydroxyphenyl dialkyl sulfonium salt cationic curing agent were discussed. The curing reaction is driven by two chain propagation mechanisms. At the initial stage of the polymerization, the propagation is dominated by activated chain end (ACE) mechanism with a faster curing rate. At long time of the polymerization, the propagation is dominated by activated monomer (AM) mechanism with a lower curing rate. With the increase of curing agent content, the activation energy of ACE mechanism reduces, however, the activation energy of AM mechanism decreases first and then increases. In addition, the surface curing test was used to evaluate the fast-curing ability of this epoxy system. By adopting preferred formulation and process, this epoxy system could be cured in several seconds.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-022-11381-w