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Temperature dependent changes of physicochemical and tribological properties of NBR elastomer upon ageing in hexadecane and DGDE
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0002-4755-5754
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0003-1067-7990
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-1454-1118
2012 (English)In: 15th Nordic Symposium on Tribology - NordTrib 2012: 12 - 15 June 2012 - Trondheim, Norway, Trondheim: Department of Geography, Norwegian University of Science and Technology, 2012Conference paper, Published paper (Refereed)
Abstract [en]

Acrylonitrile-butadiene rubber (NBR) elastomers are widely used in seal and tire industries. Physiochemical, surface and tribological properties of NBR exposed to a lubricant in a sealed mechanical contact may gradually change, in particular, at elevated temperatures. In this study, industrial-grade NBR elastomers were aged in two model non-additivated base oils, namely non-polar hexadecane (HEX) and polar Diethylene Glycol Dibutyl Ether (DGDE) at both ambient (298 K) and elevated (398 K) temperatures from 1 to 168 hours. Mass changes of NBR before and after ageing indicated that NBR had distinct ageing dynamics in different model base oils and at different temperatures. For NBR aged in nonpolar HEX, the rate of weight loss of the rubber was larger at 398 K compared to that at 298 K. On the contrary, distinct weight-gaining (swelling) dynamics were observed for NBR aged in polar DGDE at 298 and 398 K. Based on Fourier Transform Infrared (FTIR), liquid and solid-state Nuclear Magnetic Resonance (NMR) spectroscopy and Energy Dispersive Spectroscopy (EDS) analysis it was found that aldehydes and sulfur- and zinc-containing compounds were leached out from NBR aged in both HEX and DGDE. The results of tribological studies showed that the non-aged NBR has a good wear-resistance. NBR samples had a very similar surface topography before and after tribo-tests. However, the worn surfaces of NBR samples were characterized by fine scoring (abrasion) marks after ageing in both model base oils. This has been attributed to changes in the steel-rubber contact environment during the sliding process and degradation of mechanical properties of NBR after ageing. For one NBR sample (after ageing in HEX at 398 K) very stable friction in the steel-rubber contact was observed.

Place, publisher, year, edition, pages
Trondheim: Department of Geography, Norwegian University of Science and Technology, 2012.
National Category
Chemical Process Engineering Physical Chemistry Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Chemical Technology; Chemistry of Interfaces; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-31857Local ID: 629cc437-a609-417d-b693-89172d415244OAI: oai:DiVA.org:ltu-31857DiVA, id: diva2:1005091
Conference
Nordic Symposium on Tribology : 12/06/2012 - 15/06/2012
Note
Godkänd; 2012; 20120830 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved

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