Abstract
Oligomeric reaction products obtained by acid- or base-catalyzed condensation of phenol and formaldehyde are characterized using desorption methods of ionization. Desorption electron ionization (DEI) and chemical ionization (DCI), thermospray (TSP), potassium ionization of desorbed species (K + IDS), field desorption (FD), and fast atom bombardment (FAB) techniques were performed on commercial sector or quadrupole instruments. The recorded mass spectra are interpreted in terms of the prevailing mechanism of ionization, of possible thermal damage of the samples during analysis, and of furnishing quantitative data. The methods afford meaningful spectra of oligomers synthesized by acid-catalyzed condensation (Novolak), but reliable quantitative measures of molecular weight distribution are obtainable only from FD, K + IDS and DEI mass spectra
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