Structural Characterization of Aromatic Polyester Resins by Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry

Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry was used to characterize average molecular weights and end-groups of synthetic aromatic polyesters and the same characteristics were also determined for acetylated polyester samples. In addition, the progress of a polyesterificati...

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Bibliographic Details
Published in:European journal of mass spectrometry (Chichester, England) England), 2001-02, Vol.7 (1), p.15-23
Main Authors: Laine, Olli, Vainiotalo, Pirjo, Österholm, Heidi, Järvinen, Hannele
Format: Article
Language:English
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Summary:Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry was used to characterize average molecular weights and end-groups of synthetic aromatic polyesters and the same characteristics were also determined for acetylated polyester samples. In addition, the progress of a polyesterification reaction was followed by mass spectrometry by investigating samples taken from the reaction mixture at different reaction times. Average molecular weights were compared with those measured by gel-permeation chromatography (GPC) and the results of quantitative end-group analysis were considered with the acid values of the polyesters. MALDI measurements were carried out using two different matrix compounds, 2,5-dihydroxybenzoic acid (DHB) and 2-(4-hydroxyphenylazo) benzoic acid (HABA). Different matrices and derivatization of the polyester influenced the width of the polymer distribution determined by mass spectrometry and further affected the proportions of differently terminated oligomers, in addition to the average molecular weight. The relative amount of the most abundant oligomer species was increased when the polymer distribution width was increased.
ISSN:1469-0667
1751-6838
DOI:10.1255/ejms.372