Material characterization using multiple analytical methods
For characterization of very complex and challenging samples four powerful analytical techniques are available:
Evolved gas analysis (EGA-MS)
For EGA analysis a short and narrow (2.5 m, 0.15 mm i.d.) deactivated capillary tube without a stationary phase is used as direct connection between GC-injector and mass-detector. As the sample is temperature programmed over a given temperature range (i.e. 40 - 800 °C) , the evolved gases flow to the detector without chromatographic separation. The result shows the simple thermogram such as a differential thermogravimetric curve for a given sample.
Single-shot analysis (Py-GCMS)
The sample cup free-falls into the preheated pyrolyzer furnace. The sample temperature goes from ambient to the pyrolysis temperature in less than 20 msec. Pyrolysis occurs instantly and the pyrolyzates are introduced into a capillary column for separation without second reaction.
Double-Shot analysis (TD/Py-GCMS)
Double Shot analysis provides both: information about volatile compounds e.g. monomers or additives and the polymeric content of the sample. Therefore the sample analysis is divided into two steps:
Step 1: during the thermal desorption step the sample is heated over a temperature range and the volatile compounds evolve from the sample. The evaporated compounds are trapped at the beginning of the GC column and analyzed via GCMS after the temperature program of the pyrolyzer is finished.
Step 2: the residual sample is pyrolyzed at a temperature determined by EGA data. The program facilitates the identification of the polymeric composition of the sample.
Heart-cut analysis (Heart-cut EGA-GCMS)
In cases where highly complex samples demand a detailed analysis, Heart-cut EGA-GCMS is the most useful technique to determine the composition of the sample. In this technique, the evolved gas analysis (EGA) is used to obtain a thermogram and each temperature zone of interest can be analyzed separately. By heart cutting components evaporated in this interesting temperature zones are selectively introduced to a GC column, temporarily trapped at the beginning of the column and finally analyzed by GCMS. This technique allows a detailed characterization of a polymer as well as target compound analysis in complex matrix, e.g. additive analysis in mineral oil.
For Research Use Only. Not for use in diagnostic procedures.
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