Probing the molecular design of hyper-branched aryl polyesters towards lubricant applications

Robinson, Joshua W.; Zhou, Yan; Bhattacharya, Priyanka; Erck, Robert; Qu, Jun; Bays, J. Timothy; Cosimbescu, Lelia

doi:10.1038/srep18624

Probing the molecular design of hyper-branched aryl polyesters towards lubricant applications

Journal Article · Mon Jan 04 23:00:00 EST 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep18624· OSTI ID:1240532

Robinson, Joshua W. ^[1]; Zhou, Yan ^[2]; Bhattacharya, Priyanka ^[1]; Erck, Robert ^[3]; Qu, Jun ^[2]; Bays, J. Timothy ^[1]; Cosimbescu, Lelia ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

We report novel polymeric materials that may be used as viscosity index improvers (VII) for lubricant applications. Our efforts included probing the comb-burst hyper-branched aryl polyester architecture for beneficial viscosity and friction behavior when utilized as an additive in a group I oil. The monomer was designed as to undergo polymerization via polycondensation within the architectural construct (AB2), typical of hyperbranched polymers. The monomer design was comprised of aliphatic arms (12 or 16 methylenes) to provide the necessary lipophilicity to achieve solubility in a non-polar medium. Once polymerized, via catalyst and heat, the surface alcohols were functionalized with fatty acids (lauric and palmitic). Controlling the aliphatic nature of the internal arms and peripheral end-groups provided four unique flexible polymer designs. Changing the reaction time and concentration provided opportunities to investigate the influence of molecular weight and branching density on oil-solubility, viscosity, and friction. Oil-solubility was found to decrease with fewer internal carbons, but the number of internal carbons appears to have little influence on the bulk solution viscosity. Increased branching and degree of polymerization, and thus molecular weight, were found to reduce the solubility of these systems in the base oil. At concentrations of 2 wt % in a group I base oil, these polymer additives demonstrated improved viscosity index and reduced friction coefficient, validating the basic approach.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1240532

Alternate ID(s):: OSTI ID: 1330856
OSTI ID: 1341006
OSTI ID: 1249365
OSTI ID: 1251125

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Review of Viscosity Modifier Lubricant Additives Martini, Ashlie; Ramasamy, Uma Shantini; Len, Michelle Tribology Letters, Vol. 66, Issue 2 https://doi.org/10.1007/s11249-018-1007-0	journal	March 2018

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Probing the molecular design of hyper-branched aryl polyesters towards lubricant applications

Journal Article · Mon Jan 04 23:00:00 EST 2016 · Scientific Reports · OSTI ID:1330856

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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viscosity modifier

Probing the molecular design of hyper-branched aryl polyesters towards lubricant applications

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