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Lubricants 2017, 5(3), 27; doi:10.3390/lubricants5030027

Time-Resolved Characterization of Dynamic Tribochemical Processes for Dicationic Imidazolium Ionic Liquid

1
Spanish National Research Council, Institute “Eduardo Torroja” (IETCC-CSIC), C/Serrano Galvache 4, 28033 Madrid, Spain
2
Anton Paar TriTec SA, Rue de la Gare 4, 2034 Peseux, Switzerland
3
Spanish National Research Council, Institute of Material Science of Madrid (ICMM-CSIC), C/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 16 June 2017 / Revised: 19 July 2017 / Accepted: 20 July 2017 / Published: 25 July 2017
(This article belongs to the Special Issue Ionic Liquids in Tribology)
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Abstract

Dynamic tribochemical processes for dicationic ionic liquid containing a geminal imidazolium cation head group bridged by a poly(ethylene glycol) and a bis(trifluoromethylsulfonyl)imide anion were studied using time-resolved mechanically stimulated gas emission mass-spectrometry (MSGE-MS). In comparison with similar monocationic imidazolium ionic liquids with short alkyl or long polyether side chains, the dicationic ionic liquid had a lower coefficient of friction on Ti6Al4V alloy and smoother behavior. The analysis of volatile decomposition products suggested multiple tribochemical reactions in which both anionic and cationic moieties are involved. The tribochemical degradation of cations was mainly through the detachment of the side and bridging chains from the imidazolium head groups. The absence of volatile products containing nitrogen implies that the imidazole group remained unchanged. Hydrogen and water desorption were attributed to the reactions of hydrogen fluoride being a product of anion degradation with titanium and titanium oxide, respectively. View Full-Text
Keywords: ionic liquids; dicationic; imidazolium; poly(ethylene glycol); tribochemistry; mechanically stimulated gas emission mass-spectrometry ionic liquids; dicationic; imidazolium; poly(ethylene glycol); tribochemistry; mechanically stimulated gas emission mass-spectrometry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nevshupa, R.; Conte, M.; Guerra, S.; Roman, E. Time-Resolved Characterization of Dynamic Tribochemical Processes for Dicationic Imidazolium Ionic Liquid. Lubricants 2017, 5, 27.

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