Jump to main content
Jump to site search


Characterization of polyalphaolefins using halogen anion attachment in atmospheric pressure photoionization coupled to ion mobility spectrometry - mass spectrometry

Abstract

Polyalphaolefins (PAOs) are saturated alpha olefins oligomers used as base stock oil for synthetic lubricants. The synthetic base stocks are manufactured from linear alpha olefins by catalytic oligomerization processes. The aim of this work was the characterization of different PAO grades, synthesized from different linear alpha olefins using two oligomerization processes, acid and metallocene catalyses. Negative ion atmospheric pressure photoionization (APPI) coupled to ion mobility-mass spectrometry (IM-MS) permitted to detect intact PAO adducts with either chloride, bromide or iodide ions using halogenated solvents (e.g. dichloromethane, dibromomethane and diiodomethane) and toluene as dopant. The best signal-to-noise ratio was obtained with dichloromethane. APPI mass spectra display characteristic ion distributions of high viscosity PAO grades. The mass shift between two adjacent ions permitted to identify repeating units and consequently the monomers of alpha olefins used to manufacture the PAO. For low PAO grades, the halide anion adducts were not detected as they are less stable. The IM-MS data as well as the correlated variables, i.e. drift time and full width at half maximum (FWHM) of IMS peaks, can be used to differentiate polyalphaolefins of the same grades but differently synthetized

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 May 2018, accepted on 13 Jul 2018 and first published on 13 Jul 2018


Article type: Paper
DOI: 10.1039/C8AN00920A
Citation: Analyst, 2018, Accepted Manuscript
  •   Request permissions

    Characterization of polyalphaolefins using halogen anion attachment in atmospheric pressure photoionization coupled to ion mobility spectrometry - mass spectrometry

    A. Mendes-Siqueira, M. Beaumesnil, M. Hubert-Roux, C. Loutelier-Bourhis, C. Afonso, S. Pondaven, Y. Bai and A. Racaud, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN00920A

Search articles by author

Spotlight

Advertisements