Combined Thermogravimetric Analysis and Gas Chromatography

Written by on May 2, 2011 in Products - No comments
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For the analysis of complex reactions such as the release of gases
from additives made of polymer blends, thermogravimetric analysis
alone is often not sufficient. Coupling the thermobalance (TGA) to a
gas chromatograph (GC), however, yields additional findings to help in
identifying the components released.

NETZSCH, in collaboration with JAS (Joint Analytical Systems), has
forged a breakthrough improvement in reaction gas analysis. Reaction
gases from the TGA are fed directly into the GC valve box by means of
a heated transfer line. Via 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 sets the new system apart is the
fact 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.

By comparison, in other systems where TGA is coupled to GC, the
reaction gases are usually bound in their entirety to an adsorber and
only defined once the thermogravimetric analysis is complete. The
disadvantage of such a system is that it does not allow for any
conclusions to be drawn with reference to the time of the release of
the compound.


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