Enriching Heteroelements in Lignin as Lubricating Additives for Bioionic Liquids

Mu, Liwen (author): Luleå tekniska universitet,Maskinelement,Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron

Shi, Yijun (author): Luleå tekniska universitet,Maskinelement,State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, China

Guo, Xiaojing (author): Shanghai Institute of Applied Physics, Chinese Academy of Sciences

Wu, Jian (author): State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology

Ji, Tuo (author): Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron

Chen, Long (author): Department of Chemical and Biomolecular Engineering, The University of Akron, Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron

Feng, Xin (author): State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing University of Chemical Technology, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology

Lu, Xiaohua (author): State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, College of Chemistry and Chemical Engineering, Nanjing University of Technology

Zhu, Jiahua (author): State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology

(creator_code:org_t)

2016-06-08
2016
English.
In: ACS Sustainable Chemistry and Engineering. - : American Chemical Society (ACS). - 2168-0485. ; 4:7, s. 3877-3887

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

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

By the author/editor: Mu, Liwen; Shi, Yijun; Guo, Xiaojing; Wu, Jian; Ji, Tuo; Chen, Long; show more...; Feng, Xin; Lu, Xiaohua; Hua, Jing; Zhu, Jiahua; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Tribology

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