Pyrolysis GC-MS for identification and characterization of rubbers used in tires and membrane (diaphragm) pumps
Dr. Michael Soll
We have developed a vertical micro-furnace pyrolyzer utilizing a free-fall sample introduction mechanism along with various functions such as temperature programmable heating. Frontier Lab pyrolyzer 3030D combined with a GC/MS-system has become one of the most powerful analytical instruments in various fields such as the characterization of synthetic and natural polymers, art dyes and materials, archaeological artefacts, forensic, soil organic matter and biological samples.
Here, the system design and system setup is explained, as well as the 4 analytical methods (EGA-MS, TD-GC/MS, Pyrolysis-GC/MS and Heart-Cut GC-MS) for deformulation of even complex materials. For identification of the polymers, F-Search is used. F-Search is a database software specifically designed to characterize polymeric materials and additives from pyrograms and EGA thermograms. The core of F-Search is a patented search algorithm that together with specialized Frontier Lab. MS libraries, facilitates the characterization of polymers and additives.
Two applications will be presented. In the first example 2 tire samples will be analysed and identified as car tire and bus tire due to their different polymeric composition. Results from EGA-MS (Thermograms) and Pyrolysis GC/MS (Pyrograms) and the comparison with F-Search libraries are presented.
The second example is describing a failure analysis report of two membrane pumps samples with different damage history. EGA-MS, Single Shot Pyrolysis and Heart Cut EGA-GC/MS were performed to identify the differences in these two samples. Using F-Search, the comparison of “good” and “bad” sample is shown. Beside other unconformities, the absence of Chloropren was the most significant difference in the “bad” sample.