Simultaneous Measurement of Thermogravimetry-Differential Thermal Analysis and Miniature Ion Trap Mass Spectrometry equipped with Skimmer-type Interface, TG-DTA-ITMS

摘要

Simultaneous thermogravimetry-differential thermal analysis and miniature ion trap mass spectrometry (TG-DTA-ITMS) instrument equipped with a skimmer-type interface has been successfully developed. A real-time monitoring analysis of activated organic compounds such as pyrolysates can be performed precisely because transformation of the gaseous species evolved from TG-DTA is suppressed by the skimmer-type interface and fragmentation during ionization can be avoided with soft ionization method by photoionization (PI). In addition to that the miniaturized ITMS is equipped with further unique MS/MS function. These features permit a better understanding of the complicated thermal behavior and the precise pyrolysates of materials. The pyrolysis of various standard reagent polymers such as poly(methyl methacrylate) (PMMA) and polystyrene (PS) have been examined by the TG-DTA-ITMS in inert atmosphere. The synergy effect of the skimmer-type interface and the ITMS was evaluated comparatively with conventional quadruple mass spectrometry (QMS) results. It was confirmed that the real-time monitoring ITMS/MS worked satisfactorily. A valuable application of the TG-DTA-ITMS is particularly demonstrated in the detailed analysis of commercial polymers.