Generated gas analysis of styrene-butadiene rubber using high-resolution TG-TOFMS (2)
MSTips No. 344
Styrene-butadiene rubber (SBR) is used in a variety of products, including automotive tires, industrial products, and negative electrode binder materials for lithium batteries. Many synthetic rubber products, including SBR, contain various additives such as vulcanization accelerators, and information on the gases produced by heating is extremely important for evaluating product properties, quality, and safety. Thermogravimetric-Mass Spectrometry (TG-MS) is effective for the analysis of synthetic rubber because it is possible to correlate and obtain on the mass change and qualitative information on the generated gas when heating is applied. On the other hand, since this method does not use chromatogram separation, many rubber pyrolysis products (mainly hydrocarbons) make it difficult to analyze trace components. Therefore, mass separation by high-resolution TOFMS JMS-T2000GC was performed and useful results were obtained. Results using the EI method are reported in MSTips 343. In this report, we describe a highly sensitive negative ion measurement method by TG-MS using the Electron Capture Ionization (ECI) method. In addition to selective detection of molecular ions, which is a feature of the soft ionization method, the ECI method can selectively detect oxygen, sulfur, and various halogen compounds with high electronegativity, a feature of the negative ionization method. Therefore, the ECI method is considered to be effective for the analysis of trace constituents.