Pyrolysis-photoionization mass spectrometry of ethylene-methyl acrylate copolymers

Thermal degradation of polyesters filled with magnesium dihydroxide and magnesium oxide

“…The chromatogram obtained for EMA corresponds to that described in the literature [30]. Indeed, characteristic products of degradation of both parts of the copolymer (ethylene and methyl acrylate parts) were observed.…”

Vacuum Ultraviolet Photoionization Mass Spectra and Cross-Sections for Volatile Organic Compounds at 10.5 eV

“…VUV-SPI is a soft ionization technique that can be adjusted to be nearly fragmentation free. Thus, recently VUV-SPI-TOFMS has been applied to diagnose several systems such as automobile exhaust gas, [3][4][5][6] pyrolysis of polymers [7][8][9][10][11] and coals, 12 flue gas, 13,14 cigarette smoke, 11,[15][16][17] silicon chemical vapor deposition, [18][19][20][21][22] and aerosol particles. 23 A coherent VUV laser light at 10.5 eV (118 nm) generated by a frequency tripling of the third harmonics (355 nm) of a Nd:YAG laser is a good photoionization light source due to the easy generation and high intensity.…”

“…Thus, VUV light at 10.5 eV has been used as the photoionization source of molecules. 3,4,[7][8][9][10][11][12][13]15,[20][21][22][23][24][25][26][27][28] When the photoionization cross-sections for VOCs are known, quantitative detection becomes possible by comparison with intensities from the standard sample. Although photoionization efficiency curves for many molecules have been reported, the data of the absolute photoionization cross-sections of VOCs are very limited.…”

Mass Spectrometry of Chemical Polymers

“…Application of MALDI MS to nonpolar polymers received increasing attention during this period. Py-PI (9,10) and DCI (11) were applied to nonpolar polymers, but most of the attention was fundamental studies directed at using either MALDI or laser desorption/ionization methods. A solvent-free preparation method was described that used silver trifluoroacetate to cationize low molecular weight parafins and microcrystalline waxes (12).…”

“…Analysis of copolymers was well represented during the covered period even though, or because, the characterization of copolymers is more difficult than that of homopolymers. In addition to the molecular information desired for all polymers (e.g., molar mass distribution, repeat unit and end group composition, and branch points), additional information is desired for copolymers (e.g., molar fraction of each type of repeat unit, the average length of chains of each polymer type, and the variation of composition as a function of molecular weight MALDI were applied to copolymer characterization (10,(46)(47)(48)(49)(50), MALDI MS was well represented. MALDI was used to determine the average molecular weight of standard polyethylene-poly(ethylene glycol) copolymers (37), but others have found MALDI to be problematic for determining the relative mole fraction of each monomer type in a copolymer.…”