Analytical Sciences

Thermal Decomposition Behavior of a Chelating Resin Immobilizing Carboxymethylated Polyethyleneimine: Possibility of Estimation of Carboxymethylation Rate

Shigehiro KAGAYA,* Yuji MISHIMA,** Issei OBATA,* Makoto GEMMEI-IDE,* Yoshinori INOUE,* and Takahisa TSUGOSHI***

*Graduate School of Science and Engineering for Research, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
**Kobe Material Testing Laboratory Co., Ltd., 3-2-24 Wadamiya-dori, Hyogo, Kobe, Hyogo 652-0863, Japan
***National Institute of Advanced Industrial Science and Technology (AIST), Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan

Chelating resins immobilizing carboxymethylated polyethyleneimine (CM-PEI) with different carboxymethylation rates were prepared. The thermal decomposition behavior of CM-PEI resins was investigated using thermogravimetry–differential thermal analysis/photo ionization–quadrupole mass spectrometry (TG-DTA/PI-QMS) and ion attachment ionization–quadrupole mass spectrometry equipped with direct inlet probe (DIP/IA-QMS). The obtained results suggested that the carboxymethyl group decomposed at relatively low temperature (150 °C – 300 °C); the peak areas at m/z 45 and 59 in TG-DTA/PI-QMS and m/z 58, 70, and 72 in DIP/IA-QMS significantly increased with increasing carboxymethylation rate. These relationships should be useful for estimating the carboxymethylation rate of CM-PEI resin.

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