Mass Spectrometric Study of Products of Teflon Degradation via Surface-Activated Laser Desorption/Ionization
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ICAL CHEMISTRY OF SURFACE PHENOMENA
Mass Spectrometric Study of Products of Teflon Degradation via Surface-Activated Laser Desorption/Ionization A. Yu. Sholokhovaa,*, A. I. Malkina, and A. K. Buryaka a Frumkin
Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071 Russia *e-mail [email protected]
Received March 13, 2020; revised March 13, 2020; accepted March 17, 2020
Abstract—Powders of metals (magnesium and tungsten) and nonmetals (boron and silicon) are used to analyze Fluralit-4 Tef lon (polytetraf luoroethylene) powder by means of surface-activated laser desorption/ionization. It is shown that this technique allows the degree of Teflon degradation to be determined. It is established that when silicon powder is used as a matrix, it is possible to register both low molecular weight products of the degradation of Teflon and its oligomeric products in the range of up to 1400 Da. The Teflon mass spectra contain two series of ions: one for saturated components and one for unsaturated components. Keywords: surface-initiated mass spectrometry laser desorption/ionization, surface chemistry, degradation products, Teflon DOI: 10.1134/S003602442010026X
INTRODUCTION Rapid analysis of oligomeric and relatively low molecular weight compounds is one of the most common applications of mass spectrometry (MS) with laser desorption/ionization (LDI) [1]. MALDI ionization mass spectrometry (Matrix Assisted Laser Desorption/Ionization) uses soft ionization to analyze labile and high molecular weight compounds without their degradation, and to identify clusters that form on surfaces upon ionization. MALDI is widely used for analyzing biological macromolecules (peptides, proteins and protein complexes) [2], synthetic polymers [3], and nanoparticles [4]. Polymers were first analyzed using MALDI in [5], and it is now an indispensable tool in such studies. Due to the diversity and structural complexity in the chemistry of polymers, however, their analysis by MALDI remains a major problem [6]. The use of organic matrices can produce adducts of their own in the region of low molecular weights (3.0.CO;2-# 12. S. Alimpiev, A. Grechnikov, J. Sunner, et al., J. Chem. Phys. 128, 014711 (2008). https://doi.org/10.1063/1.2802304 13. I. C. Lu, C. Lee, Y. T. Lee, and C. K. Ni, Ann. Rev. Anal. Chem. 8, 21 (2015). https://doi.org/10.1146/annurev-anchem-071114-040315 14. I. S. Goncharova, I. S. Pytskii, and A. K. Buryak, Prot. Met. Phys. Chem. Surf. 50, 723 (2014). https://doi.org/10.7868/S0044185614060047
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