Journal
MOLECULES
Volume 23, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/molecules23030537
Keywords
lignin; organosolv; lubrication; biomass; hydrogen bonding
Funding
- Swedish Kempe Scholarship Project [JCK-1507]
- Swedish Research Council for Environment, Agricultural Sciences, and Spatial Planning (Formas) [2016-01098]
- Mistra foundation [MI16.23]
- NSF [CBET-1603264]
- American Chemical Society Petroleum Research Fund [55570-DNI10]
- University of Akron
- State Key Laboratory of Materials-Oriented Chemical Engineering [KL15-03]
- Bio4Energy, a Swedish strategic research environment
- Kempe Foundations
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Ethylene glycol (EG)-based lubricant was prepared with dissolved organosolv lignin from birch wood (BL) and softwood (SL) biomass. The effects of different lignin types on the rheological, thermal, and tribological properties of the lignin/EG lubricants were comprehensively investigated by various characterization techniques. Dissolving organosolv lignin in EG results in outstanding lubricating properties. Specifically, the wear volume of the disc by EG-44BL is only 8.9% of that lubricated by pure EG. The enhanced anti-wear property of the EG/lignin system could be attributed to the formation of a robust lubrication film and the strong adhesion of the lubricant on the contacting metal surface due to the presence of a dense hydrogen bonding (H-bonding) network. The lubricating performance of EG-BL outperforms EG-SL, which could be attributed to the denser H-bonding sites in BL and its broader molecular weight distribution. The disc wear loss of EG-44BL is only 45.7% of that lubricated by EG-44SL. Overall, H-bonding is the major contributor to the different tribological properties of BL and SL in EG-based lubricants.
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