Thermogravimetric analysis alone is not always sufficient for the analysis of complex reactions such as the release of gases from additives made of polymer blends. Coupling the simultaneous thermobalance-DSC (STA) to a gas chromatograph (GC), however, yields additional findings to help in identifying the components released.

NETZSCH, in collaboration with Joint Analytical Systems (JAS ), has forged a breakthrough improvement in reaction gas analysis. Reaction gases from the STA are fed directly into the GC valve box by means of a heated transfer line. Through a sample loop, the substances then arrive at the GC column, where they are separated and then analyzed by means of a mass selective detector. What reportedly sets the new system apart, however, is that the start of the measurement is event-driven. This enables temperature-correlated detection of the substances released, which, in turn, allows for direct correlation with mass loss steps.

PNNL will reportedly be using the new system to analyze the production of simulated radioactive waste glass from batch chemistry through the melt state while monitoring the evolved gasses. The data will then be used to populate models to predict melt performance through changes in composition.

For additional details, visit www.netzsch.com.