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@PHDTHESIS{Vafaei:1017334,
author = {Vafaei, Seyedmohammad},
othercontributors = {Jacobs, Georg and Schmitz, Katharina},
title = {{T}ribological performance of bio-based greases with
polymer thickener systems},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2025-07321},
pages = {1 Online-Ressource : Illustrationen},
year = {2025},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, Rheinisch-Westfälische Technische
Hochschule Aachen, 2025},
abstract = {Currently, most commercially available lubricating greases
are produced from petrochemical materials. Petrochemical
lubricants used in machines and systems in various
industries get leaked or disposed of into the environment,
which imposes significant threats to the ecosystems. Toxic
petrochemical materials pollute water, air, and soil, which
leads to several diseases and health problems for humans and
animals. A promising solution to these threats lies in the
transition to bio-based, non-toxic lubricants. A growing
interest in scientific research towards synthesizing
bio-based lubricants, including lubricating greases, has
been observed in recent decades. However, such developed
bio-based alternative greases were mostly plant-based and
could not compete with their polymeric petrochemical
counterparts regarding their performance in rolling element
bearings; thus, they were often not integrated into the
industrial machines. To produce competitive lubricating
greases for application in rolling element bearings, it is
essential to consider both development and evaluation
process, while considering their correlations. This thesis
employs a methodological development of bio-based
lubricating greases with different polymer thickener systems
and a comprehensive assessment of their tribological
performance at the tribometer and component level. It also
includes the tribological performance of the bio-based
polymeric greases compared to the petrochemical polymeric
counterpart. Understanding the correlation between the
grease's physicochemical characteristics and tribological
performance on different scales elucidates the potential for
the design of competitive bio-based greases. Therefore, the
correlation of tribological performance with physicochemical
parameters in different scales is also covered in this work.
The findings of this work facilitate the future development
of lubricating greases, specifically bio-based greases, and
contribute to the transition toward the integration of
sustainable lubricating greases in rolling element bearings
across various industry sectors.},
cin = {411710},
ddc = {620},
cid = {$I:(DE-82)411710_20190404$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2025-07321},
url = {https://publications.rwth-aachen.de/record/1017334},
}
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