], diazoaminoderivatives [ 10 ], agricultural residues [ 11 ], etc. Furthermore, with the development of instrumental analyzing methods, another hyphenated technique, pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), has been widely used to evaluate the thermal
using Py-GC/MS [ 12 ]. The characteristic temperature of basalt fiber was also obtained [ 13 ]. Although the considerable efforts have been devoted to study the high performance fibers structure, thermal properties, and their relationship, and thermal
Authors:W.-C. Xie, X.-H. Gu, Z.-C. Tan, J. Tang, G.-Y. Wang, C.-R. Luo, and L.-X. Sun
To develop thermal stable flavor, two glycosidic bound flavor precursors, geranyl-tetraacetyl-β-D-glucopyranoside (GLY-A) and geranyl-β-D-glucopyranoside (GLY-B) were synthesized by the modified Koenigs–Knorr reaction. The thermal decomposition process and pyrolysis products of the two glycosides were extensively investigated by thermogravimetry (TG), differential scanning calorimeter (DSC) and on-line pyrolysis-gas chromatography mass spectroscopy (Py-GC-MS). TG showed the Tp of GLY-A and GLY-B were 254.6 and 275.7°C. The Tpeak of GLY-A and GLY-B measured by DSC were 254.8 and 262.1°C respectively.
Py-GC-MS was used for the simply qualitative analysis of the pyrolysis products at 300 and 400°C. The results indicated that: 1) A large amount of geraniol and few by-products were produced at 300°C, the by-products were significantly increased at 400°C; 2) The characteristic pyrolysis product was geraniol; 3) The primary decomposition reaction was the cleavage of O-glycosidic bound of the two glycosides flavor precursors. The study on the thermal behavior and pyrolysis products of the two glycosides showed that this kind of flavor precursors could be used for providing the foodstuff with specific flavor during heating process.
Authors:M. Arshad, K. Masud, M. Arif, S. Rehman, M. Arif, J. Zaidi, Z. Chohan, A. Saeed, and A. Qureshi
The thermal behavior of poly(methyl methacrylate) (PMMA) was studied in the presence of AlBr3 using TG-DTA-DTG, IR and Py-GC-MS techniques. Degradation products were identified. It was found that PMMA started degrading
at a lower temperature due to the generation of free radicals (Br•), being the product of decomposition of AlBr3. Despite early destabilization of the system, stabilization zone was also highlighted. Flammability test was conducted to
check the affectivity of AlBr3. Degradation mechanism has been proposed. Pyrolysis of the system (PMMA–AlBr3) was also monitored by heating it at different temperatures.
Authors:X. Han, Y. Hu, Z. Lin, S. Li, F. Zhao, Z. Liu, J. Yi, L. Zhang, and X. Ren
Effects of fullerenes including FS, EFS and pure C60 on thermal behaviors of polyethylene glycol (PEG) have been studied by employing thermogravimetry-differential thermogravimetry
(TG-DTG), differential scanning calorimeter (DSC) and off-line furnace-type pyrolysis-gas chromatography/mass spectrometry
(Py-GC/MS). The products were collected by Cambridge filter pad which was widely used in analyzing the combustion products
of cigarette. The results showed that the addition of fullerenes obviously restrained the thermal decomposition of PEG. The
initial decomposition temperatures (IDT) and maximum decomposition peak temperatures (MDT) were evidently postponed by the
addition of fullerenes. Pyrolysis products with one or two hydroxyl end groups obviously increased with the addition of 10%
C60. The reasons of the changes were discussed from the aspects of reaction mechanisms.
Authors:Hou-yin Zhao, Yan Cao, Song P. Sit, Quentin Lineberry, and Wei-ping Pan
pyrolysis, were obtained using DAEM. Also, the production of gaseous species during the pyrolysis was examined using thermogravimetric analyzer–mass spectrometer system (TG–MS) and pyrolysis-gas chromatograph/mass spectrometer system (Py-GC/MS). A better
Authors:Yiqun Fang, Qingwen Wang, Xiaoyan Bai, Weihong Wang, and Paul A. Cooper
Thermal pyrolysis process analysis by Py–GC/MS
To find evidence how wood flour promotes the crosslinking and char formation, and then decreases the heat release and smoke emission of PVC, the thermal mechanism degradation of the PVC and WF
for the preparation of thin layer of antimicrobial coatings. Its structure is elucidated by various physicochemical techniques as FT-IR, 1 H NMR, Py–GC–MS, Ubbelohde viscometer, conductometric titration in non-aqueous medium, TG–DTG, and DSC. This
The thermal decomposition of sodium ethyl xanthate (SEX) was used to compare the techniques of pyrolysis-gas chromatography-mass
spectrometry (py-GC-MS), thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR), and TG-MS.
In the py-GC-MS analysis, SEX was pyrolysed at 400C in an inert atmosphere. Major gases evolved were carbon disulfide, diethyl
sulfide, ethanol, and carbonyl sulfide. The TG of SEX exhibited a sharp mass loss at 201C (42.3%) and a gradual mass loss
at 217-325C (20.8 %). The MS spectra of the evolved gases were complex due to overlapping of molecular, isotope, and fragment
ion signals. Using the MS in selected ion monitoring mode, the major gases evolved were found to be carbon disulfide and carbonyl
sulfide. The FTIR spectra of the evolved gases displayed vibrational frequencies due to alkanes, carbonyls, carbonyl sulfide,
and carbon disulfide.
From the analyses it was concluded that py-GC-MS provided unambiguous gas identification. Interpretation of the MS results
was reliant on the py-GC-MS results, and the FTIR data was limited to identifying gases with very characteristic vibration
Oxyreactive Thermal Analysis (OTA) and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) have been performed on highly
matured, uraniferous samples. Organic matter investigated by OTA gives two exothermic peaks on DTA curves. The dominant peak
appearing at temperature higher than 500C, confirm the high maturity of the organic matter. Results of analysis by Py-GC-MS
complement the OTA results. The organic matter in all of the samples shows the same general pyrolysis characteristics. The
pyrograms are dominated by low molecular mass aromatic hydrocarbons. The samples differ in relative abundances of the compounds.
The changes in temperature and intensity of the lower-temperature peak in OTA method and differences in relative abundances
of aromatic hydrocarbons were used to investigate differences in thermal maturity of the organic matter.