Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 4, Issue 7, Pages 3877-3887Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00669
Keywords
Lignin; Heteroelement; Depolymerization; Hydrogen bonding; Lubrication
Categories
Funding
- Swedish Kempe Scholarship Project [JCK-1507]
- University of Akron
- State Key Laboratory of Materials-Oriented Chemical Engineering [KL15-03]
- National Natural Science Foundation of China [21306220]
- American Chemical Society Petroleum Research Fund [55570-DNI10]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available