Chromatopyrography for polymer characterization

Hu, John Chih-An; Grasselli, Jeanette G.

doi:10.1021/ac00225a003

Cited by 8 publications

(1 citation statement)

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“…Chemical ionization (CI) has been used as a softer ion source to avoid the extensive fragmentation caused by EI. Slightly polar and nonpolar polymers have been investigated by desorption chemical ionization (DCI). , Another important mass spectrometric technique for polymer analysis is pyrolysis mass spectrometry (Py-MS). − Both direct probe pyrolysis (DP-MS) 8 and pyrolysis gas chromatography mass spectrometry (PyGC-MS) 9 have been widely used to study the thermal degradation of polymers. The development of field desorption (FDMS), electrodynamic (EHDMS), secondary ion (SIMS), − fast atom bombardment (FABMS), laser desorption (LDMS), − electrospray, and plasma desorption mass spectrometries have made it possible to analyze polymers without the need for vaporization.…”

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confidence: 99%

Characterization of Poly(dimethylsiloxane)s by Time-of-Flight Secondary Ion Mass Spectrometry

1997

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A series of poly(dimethylsiloxane)s (PDMS) terminated by trimethylsilyl groups, and having molecular weights from 600 to 20 000, were characterized by time-of-flight secondary ion mass spectrometry. The fragmentation patterns of the PDMS were examined. The predominant fragmentation pathway involves formation of cyclic fragments, probably via an intermediate with a four-membered ring. The relative intensities of the clusters in the PDMS fragmentation patterns were investigated as a function of sample molecular weight. The relative intensities of cyclic fragments increase with increasing polymer molecular weight. Poly(dimethylsiloxane)s containing different end groups were also investigated to determine the effect of the terminal groups on fragmentation. The terminal groups in PDMS were identified by analysis of low mass range spectra. Effects of nitrogen-containing end groups were found on the fragmentation of PDMS. Large fragments with intrinsic positive charge were observed in the spectra of PDMS terminated by (aminopropyl)dimethylsiloxy and (amidopropyl)dimethylsiloxy groups.

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