What is the effect of lipophilic polymeric ionic liquids on friction and wear?

Journal Article · Mon Jul 30 00:00:00 EDT 2018 · Reactive and Functional Polymers

DOI:https://doi.org/10.1016/j.reactfunctpolym.2018.07.020· OSTI ID:1500117

Bapat, Abhijeet P. ^[1]; Erck, Robert ^[2]; Seymour, Bryan T. ^[3]; Zhao, Bin ^[3]; Cosimbescu, Lelia ^[1]

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1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
2. Argonne National Lab. (ANL), Argonne, IL (United States)
3. Univ. of Tennessee, Knoxville, TN (United States)

In this work, methacrylate-type ionic liquid (IL) monomers containing a quaternary ammonium cation and two different counter-anions were synthesized and used as co-monomers to obtain functional poly(alkyl methacrylates) (PAMAs) as friction and wear reducing additives for lubricants. The effect of molecular weight, polymer topology (random or diblock), and IL counter anion on friction and wear behavior of polymer PAO (poly-alpha olefin) solutions have been investigated. The results were compared to those of PAO solutions additized with a small molecule, non-polymeric ionic liquid, or non-ionic copolymers containing 2-(dimethylamino)ethyl methacrylate (DMAEMA) as the polar comonomer. No clear correlation between polymer molecular weight and friction or wear behavior was observed. Random ionic liquid copolymers led to lower wear volumes than their block counterparts. Polymers containing dicyanamide (DCA) counter anion showed lower wear volume compared to those containing bis((trifluoromethyl)sulfonyl)imide (TFSI) anion. Surprisingly, none of the IL copolymers studied outperformed the DMAEMA containing block copolymer in terms of wear volume reduction, suggesting the IL moiety had no beneficial effect on wear.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technology; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE
• Grant/Contract Number: AC02-06CH11357; AC05-76RL01830; VT0604000-05450-1004897; DE_AC06–76RLO 1830
• OSTI ID: 1500117
• Alternate ID(s): OSTI ID: 1492619; OSTI ID: 1548004
• Report Number(s): PNNL-SA-134552; 151034
• Journal Information: Reactive and Functional Polymers, Vol. 131, Issue C; ISSN 1381-5148
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
RAFT polymerization
ionic liquid polymethacrylates
lipophilic ionic liquid polymers
low molecular weight PILs
polymeric ionic liquids