Pyrolysis Gas Chromatography - Mass Spectroscopy

Py-GC Fourier-transform (FT) nuclear magnetic resonance (NMR) spectroscopy is another complementary technique that provides more detailed information on the structure of polymers than does Py-GC alone. As an example of the application of this technique Leibman and co-workers [2] applied it to a study of short-chain branching in polyethylene (PE) and polyvinylchloride (PVC). The nature and relative quantities of the short branches along the polymer chains were determined, providing detailed microstructural information. Down to 0.1 methyl, ethyl, or w-butyl branches per 1000 methylene groups can be determined by this procedure. Other structural defects can also be determined, thus providing significant information on polymer microstructure that is not otherwise readily obtained. 

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Schulten H-F, Schnitzer M. Structural studies on soil humic acids by Curie-point pyrolysis-gas chromatography/mass spectroscopy. Soil Sci. 1992 153 205-224. 

Meier, D., and Faix, O., 1992, Pyrolysis-gas chromatography-mass spectroscopy, in Methods in Lignin Chemistry, S. Y. Lin and C. W. Dence, eds., Springer-Verlag, Berlin, pp. 177-199. 

The use in coal analysis of gas chromatography-mass spectroscopy as well as pyrolysis-mass spectrometry and pyrolysis gas chromatography-mass spectroscopy has enabled low-molecular-weight benzenes, phenols, and naphthalenes to be identified as well as the C27 and C29-C30 hopanes and C15 sesquiterpenes (Gallegos, 1978 Smith and Smoot, 1990 Blanc et al., 1991). 

Wilson, M. A., Philip, R. P., Gillam, A. H., Gilbert, T. D., and Tate, K. R., Comparison of structures of humic substances from aquatic and terrestrial sources by pyrolysis-gas chromatography-mass spectroscopy, Geochim. Cosmochim. Acta, 47, 497-502, 1983. 

Gadel, F. and Bmchet, A., Apphcation of pyrolysis-gas chromatography-mass spectroscopy to the characterization of humic substances resulting from decay of aquatic plants in sediments and waters. Water Res., 21, 1195-1206, 1987. 

Ahht-Braun, G., Erimmel, E. H., and Schulten, H.-R., Structural investigations of aquatic humic substances hy pyrolysis-field ionization MS and pyrolysis-gas chromatography/mass spectroscopy. Water Res., 23, 1579-1591, 1989. 

Saiz-Jimenez, C. and de Leeuw, J. W., Chemical characterization of soil organic matter by analytical pyrolysis-gas chromatography-mass spectroscopy, J. Anal Appl Pyrolysis, 9, 99-119, 1986. 

Saiz-Jimenez, C. and de Leeuw, J. W., Chemical characterization of soil organic matter by analytical pyrolysis-gas chromatography-mass spectroscopy, J. Anal. Appl. Pyrolysis, 9, 99-119, 1986. Lehtonen, T., Peuravuori, J., and Pihlaja, K., Degradation of TMAH treated aquatic humic matter at different temperatures, i. Anal. Appl. Pyrolysis, 55, 151-160, 2000. 

Vapor-Phase Monitoring by Pyrolysis Gas Chromatography/Mass Spectroscopy (PGC/MS)... 

Prokai [2] used pulse probe mass spectroscopy (MS) and pyrolysis-gas chromatography-mass spectroscopy (Py-GC-MS) to study the thermal decomposition of high molecular weight phenol-formaldehyde resins. He showed that degradation occurred by cleavage of the phenol-methylene bond and subsequent hydrogen abstraction to form phenol and methyl substituted phenols. 

Ogumi Z., Sano A., Inaba M., Abe T. Pyrolysis/gas chromatography/mass spectroscopy analysis of the surface film formed on graphite negative electrode, J. Power Soirrces 2001,97-98, 156-158. 

Mogi R., Inaba M., Myama Y., Abe X, Ogirmi Z. Study on the decomposition mechanism of eilkyl carbonate on lithiirm metal by pyrolysis-gas chromatography-mass spectroscopy, J. Power Sources 2003,119-121, 597-603. 

A third approach is pyrolysis gas chromatography-mass spectroscopy (Py-gcms). This is a hybrid of the two previous methods, in which the pyrolysis products are separated by gc and then injected directly into an on-line MS, often a small quadrupole instrument. The gc serves to give rapid separation of the products where the MS acts both as a gc detector (in total ion current mode) and as an analytical tool. 

Techniques used in thermal degradation studies include controlled pyrolysis-gas chromatography-mass spectroscopy (Py-GC-MS), MS, controlled pyrolysis infrared (IR) spectroscopy, differential scanning calorimetry (DSC) and IR spectroscopy. Equipment suppliers are reviewed in Appendix 1. 

Polyvinyl alcohol Pyrolysis-gas chromatography Pyrolysis-gas chromatography-mass spectroscopy Relative humidity... 

Dan and co-workers [8] studied the structures and thermal and thermo-oxidative stabilities of the gel and chlorinated natural rubber from latex. The polymers were analysed by chemical analysis, high-resolution pyrolysis-gas chromatography-mass spectroscopy (HR-Py-GC-MS) coupled with Fourier-transform infrared spectroscopy, and thermal analysis techniques [dynamic thermal analysis and thermogravimetric analysis (TGA)]. 

High-resolution pyrolysis-gas chromatography-mass spectroscopy... 

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