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Quantification of anhydride groups in anhydride‐based epoxy hardeners by reaction headspace gas chromatography
Author(s) -
Xie WeiQi,
Gong YiXian,
Yu KongXian
Publication year - 2017
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201700298
Subject(s) - epoxy , gas chromatography , sodium bicarbonate , chemistry , chromatography , bicarbonate , organic chemistry
We demonstrate a reaction headspace gas chromatographic method for quantifying anhydride groups in anhydride‐based epoxy hardeners. In this method, the conversion process of anhydride groups can be realized by two steps. In the first step, anhydride groups in anhydride‐based epoxy hardeners completely reacted with water to form carboxyl groups. In the second step, the carboxyl groups reacted with sodium bicarbonate solution in a closed sample vial. After the complete reaction between the carboxyl groups and sodium bicarbonate, the CO 2 formed from this reaction was then measured by headspace gas chromatography. The data showed that the reaction in the closed headspace vial can be completed in 15 min at 55°C, the relative standard deviation of the reaction headspace gas chromatography method in the precision test was less than 3.94%, the relative differences between the new method and a reference method were no more than 9.38%. The present reaction method is automated, efficient and can be a reliable tool for quantifying the anhydride groups in anhydride‐based epoxy hardeners and related research.