TY - JOUR
T1 - Lignin in Ethylene Glycol and Poly(ethylene glycol)
T2 - Fortified Lubricants with Internal Hydrogen Bonding
AU - Mu, Liwen
AU - Shi, Yijun
AU - Wang, Huaiyuan
AU - Zhu, Jiahua
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/3/7
Y1 - 2016/3/7
N2 - Lignin, one of the most naturally abundant polymers, has been successfully incorporated into ethylene glycol (EG) and poly(ethylene glycol) (PEG) in this work and fortified lubricating properties were achieved in EG/lignin and PEG/lignin. The molecular interaction between lignin and EG (or PEG) has been revealed as hydrogen bonding, which serves as the dominating factor that determines the thermal, rheological, and tribological properties of the mixed systems of EG/lignin and PEG/lignin. The physicochemical properties of the mixed lubricants are tightly related to the state of internal hydrogen bonding (EG-EG, PEG-PEG, EG-lignin, PEG-lignin, and lignin-lignin) and are well correlated to their lubrication properties. Generally, larger lignin fractions lead to better lubricating performance in both EG and PEG systems. Lignin liquefaction in PEG has been addressed by catalytic degradation with the presence of sulfuric acid, which was then neutralized by triethanolamine for lubricant development. Lignin in PEG significantly improves the lubricating property at higher pressure conditions, where a wear reduction of 94.6% was observed. Lignin fortified EG and PEG based lubricants show outstanding noncorrosive characteristic to the mostly used metal materials such as aluminum and iron.
AB - Lignin, one of the most naturally abundant polymers, has been successfully incorporated into ethylene glycol (EG) and poly(ethylene glycol) (PEG) in this work and fortified lubricating properties were achieved in EG/lignin and PEG/lignin. The molecular interaction between lignin and EG (or PEG) has been revealed as hydrogen bonding, which serves as the dominating factor that determines the thermal, rheological, and tribological properties of the mixed systems of EG/lignin and PEG/lignin. The physicochemical properties of the mixed lubricants are tightly related to the state of internal hydrogen bonding (EG-EG, PEG-PEG, EG-lignin, PEG-lignin, and lignin-lignin) and are well correlated to their lubrication properties. Generally, larger lignin fractions lead to better lubricating performance in both EG and PEG systems. Lignin liquefaction in PEG has been addressed by catalytic degradation with the presence of sulfuric acid, which was then neutralized by triethanolamine for lubricant development. Lignin in PEG significantly improves the lubricating property at higher pressure conditions, where a wear reduction of 94.6% was observed. Lignin fortified EG and PEG based lubricants show outstanding noncorrosive characteristic to the mostly used metal materials such as aluminum and iron.
KW - Catalytic degradation
KW - Hydrogen bonding
KW - Lignin
KW - Lubrication
KW - Microwave
UR - http://www.scopus.com/inward/record.url?scp=84960153463&partnerID=8YFLogxK
U2 - 10.1021/acssuschemeng.6b00049
DO - 10.1021/acssuschemeng.6b00049
M3 - 文章
AN - SCOPUS:84960153463
SN - 2168-0485
VL - 4
SP - 1840
EP - 1849
JO - ACS Sustainable Chemistry and Engineering
JF - ACS Sustainable Chemistry and Engineering
IS - 3
ER -
