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TY - THES AU - Vafaei, Seyedmohammad TI - Tribological performance of bio-based greases with polymer thickener systems PB - Rheinisch-Westfälische Technische Hochschule Aachen VL - Dissertation CY - Aachen M1 - RWTH-2025-07321 SP - 1 Online-Ressource : Illustrationen PY - 2025 N1 - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University N1 - Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2025 AB - 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. LB - PUB:(DE-HGF)11 DO - DOI:10.18154/RWTH-2025-07321 UR - https://publications.rwth-aachen.de/record/1017334 ER -