Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 54, Issue 44, Pages 11056-11064Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.5b03069
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant Program
- Canada Research Chair program of the Federal Government of Canada
- Jiangsu Overseas Research, Training Program for University Prominent Young, Middle-Aged Teachers and President
- Qng Lan Project of Jiangsu Provincial Department of Education, China
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Some commercially available amines used as curing agents for epoxy resins can capture CO2 to form ammonium carbamates, which represent a novel type of latent blowing and curing agent for epoxy foaming: The principles in the selection of suitable amines are critical for final applications. This;work aimed to reveal these principles by screening and comparing the preparation, chemical structure and composition, and curing and foaming performance of several types of ammonium Carbamates from typical amine curing agents. It is found that amines with pK(a) >9 are eligible to react with CO2 to form ammonium carbamates with a high yield. Furthermore, the amines should have rigid cyclic groups in their structures to form a solid ammonium carbonate powder, which can be easily mixed with epoxy resins. The curing rate of the amine should not be much faster than the decomposition of the carbamate to obtain epoxy foams with good pore morphology and mechanical performance.
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