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Comparison of mass spectrometric techniques for generating molecular weight information on a class of ethoxylated oligomers

  • Focus: Synthetic Polymers
  • Published:
Journal of the American Society for Mass Spectrometry

An Erratum to this article was published on 01 June 1998

Abstract

The results of fast atom bombardment (FAB), time-of-flight secondary ion mass spectrometry (ToF-SIMS), matrix-assisted laser desorption/ionization (MALD/I), electrospray ionization (ESI), and field desorption (FD) analyses of ethoxylated oligomers of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (Surfynol® 104) were compared.Each of these desorption mass spectrometry (MS) techniques can produce spectra of unfragmented cationized oligomers. From the observed ion series we calculate average molecular weight information. We have compared the results of mass spectrometric analyses of a series of ethoxylated Surfynol surfactants. Our data indicate that FAB, ToF-SIMS, MALDI/I, and ESI produce similar results for the lower molecular weight species, but that as the average molecular weight increases FAB and SIMS produce slightly lower results than MALD/I and FD. This could be due to increased fragmentation. ESI produced a result similar to FAB and SIMS for the highest average molecular weight material. Further experiments compare the mass spectral results with gas chromatographic quantitative data. Although gas chromatography is not expected to accurately analyze the higher mass oligomers, we observe significant differences in intensities of the short-chain oligomers (especially the 0- and 1-mers) when compared to the desorption mass spectrometer results. These differences may reflect poor cationization efficiency for very short oligomer chains in the mass spectrometric analyses.

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Authors and Affiliations

  1. Air Products and Chemicals, Inc., Allentown, Pennsylvania, USA

    David M. Parees, Scott D. Hanton, Paula A. Cornelio Clark & Dale A. Willcox

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  1. David M. Parees
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  2. Scott D. Hanton
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  3. Paula A. Cornelio Clark
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Correspondence to David M. Parees.

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An erratum to this article is available at http://dx.doi.org/10.1016/S1044-0305(98)00040-3.

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Parees, D.M., Hanton, S.D., Clark, P.A.C. et al. Comparison of mass spectrometric techniques for generating molecular weight information on a class of ethoxylated oligomers. J Am Soc Mass Spectrom 9, 282–291 (1998). https://doi.org/10.1016/S1044-0305(97)00291-2

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  • DOI: https://doi.org/10.1016/S1044-0305(97)00291-2

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