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Enriching Heteroelements in Lignin as Lubricating Additives for Bioionic Liquids
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement. Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement. 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.
Vise andre og tillknytning
2016 (engelsk)Inngår i: A C S Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 4, nr 7, s. 3877-3887Artikkel i tidsskrift (Fagfellevurdert) 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

sted, utgiver, år, opplag, sider
2016. Vol. 4, nr 7, s. 3877-3887
Emneord [en]
Depolymerization, Heteroelement, Hydrogen bonding, Lignin, Lubrication
HSV kategori
Forskningsprogram
Maskinelement
Identifikatorer
URN: urn:nbn:se:ltu:diva-14572DOI: 10.1021/acssuschemeng.6b00669ISI: 000380291200036Scopus ID: 2-s2.0-84979076065Lokal ID: df69cea5-8ec2-4d4c-8898-0d25356410d0OAI: oai:DiVA.org:ltu-14572DiVA, id: diva2:987545
Merknad

Validerad; 2016; Nivå 2; 20160627 (andbra)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2019-02-22bibliografisk kontrollert

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