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Enriching Heteroelements in Lignin as Lubricating Additives for Bioionic Liquids
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. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, China.ORCID iD: 0000-0001-6085-7880
Shanghai Institute of Applied Physics, Chinese Academy of Sciences.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology.
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2016 (English)In: A C S Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 4, no 7, p. 3877-3887Article in journal (Refereed) Published
Abstract [en]

Depolymerization and modification of lignin have been achieved simultaneously in a one-pot chemical reaction. Two heteroelement-rich modifiers, imidazol-1-yl phosphonic dichloride and 1H-1,2,4-triazol-1-yl phosphonic dichloride, were selected to react with lignin in this work. The modified lignin (m-lignin) is demonstrated as an effective lubricating additive for [choline][amino acid] ([CH][AA]) bioionic liquids. Different characterization techniques have been utilized to study the lignin depolymerization, reaction between lignin and modifiers and m-lignin/[CH][AA] interaction. The effect of the molecular structure of the modifiers on the rheological and tribological properties of m-lignin/[CH][AA] lubricants was systematically investigated. Density function theory is used to calculate the electronic structure of lignin, m-lignin, and [CH][AA]. The atomic natural charge analysis revealed the most negative charge on nitrogen bonded to a phosphorus atom and the strongest capability of forming hydrogen bonding with [CH][AA]. The introduced nitrogen and phosphorus elements not only increase the hydrogen bonding density in m-lignin/[CH][AA] but also enhance the polarity of the m-lignin, both of which facilitate a strong adhesion of lubricant on a metal surface and thus promote lubrication. A larger fraction of heteroatom groups in m-lignin contributes to a better lubrication property of these lubricants

Place, publisher, year, edition, pages
2016. Vol. 4, no 7, p. 3877-3887
Keywords [en]
Depolymerization, Heteroelement, Hydrogen bonding, Lignin, Lubrication
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-14572DOI: 10.1021/acssuschemeng.6b00669ISI: 000380291200036Scopus ID: 2-s2.0-84979076065Local ID: df69cea5-8ec2-4d4c-8898-0d25356410d0OAI: oai:DiVA.org:ltu-14572DiVA, id: diva2:987545
Note

Validerad; 2016; Nivå 2; 20160627 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-02-22Bibliographically approved

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Mu, LiwenShi, YijunHua, Jing

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