Untersuchungen von Polymeren im Massenspektrometer. I. Fragmentierungsreaktionen von oligomeren β‐Alaninen

Abstract

ZUSAMMENFASSUNG :Beim Abbau von Poly-p-alaninen entstehen unter milden Pyrolysebedingungen oligomere Carbonsliureamide. Die Fragmentierungsreaktionen derartiger Pyrolysebruchstucke werden an dimeren bis tetrameren B-Lactamen untersucht. CH3 I CH3CH-CH2Als Hauptfragmentierungsreaktionen werden nach Ionisation an einem der Heteroatome LXN-, Keten-, ao-und Po-Spaltung mit MCLAFFERTY-UmlagerUng gefunden. SUMMARY:The degradation of poly-b-alanines under mild pyrolytical conditions yields oligomeric amids. Dimeric, trimeric and tetrameric p-lactames were used CH3 to study the fragmentation reactions of those degradation products.(with MCLAFFERTY-rearrangement) were found as main fragmentation reactions.

Identification of dyes in solid poly(methyl methacrylate) by means of laser desorption Fourier transform ion cyclotron resonance mass spectrometry

“…For 1 Also Department of Biochemistry. polymers of higher molecular weight, direct mass spectral analysis has not yet been effectively demonstrated, and the usual approach is to pyrolyze the sample, and then mass analyze the ions generated by electron ionization (El), chemical ionization (Cl), field ionization (FI), or field desorption (FD) (1, [25][26][27][28]. When additives are present in the polymer, thermal desorption is generally combined with El, Cl, or FI to generate ions for structural analysis (2,29,30).…”