Preprint Article Version 1 This version not peer reviewed

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

Version 1 : Received: 19 July 2017 / Approved: 19 July 2017 / Online: 19 July 2017 (22:59:19 CEST)

A peer-reviewed article of this Preprint also exists.

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

Journal reference: Lubricants 2017, 5, 27
DOI: 10.3390/lubricants5030027

Abstract

Dynamic tribochemical processes for dicationic ionic liquid containing a germinal imidazolium cation head groups bridged by a poly(ethylene glycol) and 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 alkylic or long polyether side chains the dicationic ionic liquid had lower coefficient of friction on Ti6Al4V alloy and smoother behaviour. The analysis of volatile decomposition products suggested multiple tribochemical reactions in which both anionic and cationic moieties are involved. Tribochemical degradation of cations was mainly through detachment of the side and bridging chains from the imidazolium head groups. Absence of volatile products containing nitrogen implies that 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.

Subject Areas

Ionic liquids; dicationic; imidazolium; poly(ethylene glycol); tribochemistry; mechanically stimulated gas emission mass-spectrometry

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