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Engineering Hydrogen Bonding Interaction and Charge Separation in Bio-polymers for Green Lubrication
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-6085-7880
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University.
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2017 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 121, no 22, 5669-5678 p.Article in journal (Refereed) Published
Abstract [en]

Synthetic additives are widely used in lubricants nowadays to upgrade lubrication properties. The potential of integrating sustainable components in modern lubricants has rarely been studied yet. In this work, two sustainable resources lignin and gelatin have been synergistically incorporated into ethylene glycol (EG), and their tribological properties were systematically investigated. The abundant hydrogen bonding sites in lignin and gelatin as well as their interchain interaction via hydrogen bonding play the dominating roles in tuning the physicochemical properties of the mixture and improving lubricating properties. Moreover, the synergistic combination of lignin and gelatin induces charge separation of gelatin that enables its preferable adsorption on the friction surface through electrostatic force and forms a robust lubrication layer. This layer will be strengthened by lignin through the interpolymer chain hydrogen bonding. At an optimized lignin:gelatin mass ratio of 1:1 and 19 wt % loading of each in EG, the friction coefficient can be greatly stabilized and the wear loss was reduced by 89% compared to pure EG. This work presents a unique synergistic phenomenon between gelatin and lignin, where hydrogen bonding and change separation are revealed as the key factor that bridges the individual components and improves overall lubricating properties.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 121, no 22, 5669-5678 p.
National Category
Tribology
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-63516DOI: 10.1021/acs.jpcb.7b03194ISI: 000403191700022Scopus ID: 2-s2.0-85021063830OAI: oai:DiVA.org:ltu-63516DiVA: diva2:1098390
Note

Validerad;2017;Nivå 2;2017-06-15 (rokbeg)

Available from: 2017-05-24 Created: 2017-05-24 Last updated: 2017-11-24Bibliographically approved

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Shi, YijunHua, Jing

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