Structural characterization of polyoxymethylenes by matrix-assisted laser desorption/ionization mass spectrometry

Citation
H. Sato et al., Structural characterization of polyoxymethylenes by matrix-assisted laser desorption/ionization mass spectrometry, RAP C MASS, 15(2), 2001, pp. 82-88
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
ISSN journal
0951-4198 → ACNP
Volume
15
Issue
2
Year of publication
2001
Pages
82 - 88
Database
ISI
SICI code
0951-4198(2001)15:2<82:SCOPBM>2.0.ZU;2-#
Abstract
Several polyoxymethylene (POM) model compounds with relatively low molecula r weights were characterized by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) using dithranol matrix, 1,1,1,3,3,3-hexafluor o-2-propanol solvent for matrix/analyte solution, and sodium iodide as cati onization reagent. For POM oligomers with thermally unstable hydroxyl end-g roups (paraformaldehyde), a series of sodium-cationized molecular ions up t o MW ca. 2000 was observed at good sensitivity with little or no fragmentat ion. The MALDI mass spectra of the trimethylsilylated and acetylated POM sa mples were interpreted in terms of their end-group structures and molecular weight distributions. Furthermore, the formation mechanisms of the macrocy clic POM oligomers (M-n=1500-2000), isolated by alkaline degradation of raw bulk POM obtained by cationic polymerization, are discussed by relating th em to their lamellar structures on the basis of their MALDI mass spectra. C opyright (C) 2001 John Wiley & Sons, Ltd.