Sequence distribution of poly(ether-sulfone)/poly(ether-ketone) copolymers by mass spectrometry and 13C NMR

✍ Scribed by Giorgio Montaudo; Maurizio S. Montaudo; Concetto Puglisi; Filippo Samperi

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 551 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021960206

✦ Synopsis

Abstract

The sequence distributions of four poly(ether‐sulfone)/poly(ether‐ketone) (PES/PEK) copolymer samples were determined by means of fast atom bombardment mass spectrometry (FAB‐MS) and by ^13^C NMR spectroscopy. The controlled partial degradation of the copolymer chains to produce oligomers suitable of FAB‐MS analysis was performed with sodium methoxide in dimethyl sulfoxide solution at 130°C, and the experimental conditions were optimized. The sequential arrangements of ether‐sulfone/ether‐ketone units present in these materials were estimated by a best‐fit minimization method using the MACO4 computer program which compares the experimental FAB‐MS spectral intensities with theoretical intensities. Random PES/PEK copolymer samples showed quite the same sequence arrangements as expected from monomer feed‐ratios used in the syntheses. Instead, a PES/PEK copolymer sample expected to be exactly alternating (from the synthesis procedure) showed 44% of random sequences owing to the transetherification reaction which occurred in the synthesis. The results of sequential analysis obtained from ^13^C NMR data compare well with the data obtained by the FAB‐MS analysis.