Investigation of aging behavior and mechanism of nitrile-butadiene rubber (NBR) in the accelerated thermal aging environment |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, PR China;2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266101, PR China;1. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, PR China;2. Key Laboratory of Marine Power Engineering & Technology (Ministry of Transport), Wuhan University of Technology, Wuhan 430063, PR China;3. School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia;1. KTH Royal Institute of Technology, School of Chemical Science and Engineering, Fibre and Polymer Technology, SE-100 44 Stockholm, Sweden;2. Materials Technology, Scania CV AB, SE-151 87 Södertälje, Sweden;1. State Key Laboratory of Organic Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China;2. Institute of Agricultural Products Processing, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, 524001, China;3. Department of Polymer Science, The University of Akron, Akron, OH 44325-3909, USA;4. Department of Mechanical Engineering, University of New Orleans, New Orleans, LA 70148, USA;1. SINTEF Materials and Chemistry, Department of Polymer and Composite Materials, Oslo, Norway;2. SINTEF Materials and Chemistry, Department of Thin Film and Membrane Technology, Oslo, Norway |
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| Abstract: | Nitrile-butadiene rubber (NBR) was exposed to an accelerated thermal aging environment produced by an air-circulating oven for different time periods. NBR aging was evaluated by morphology, crosslink density, mechanical properties, chemical changes and thermal stability. The results showed that the surface damage of NBR turned severe and inhomogeneous, and the aging degree was most serious on the edge region of voids. Crosslinking reactions mainly occurred in the aging process. The tensile strength increased with increase in crosslink density up to a maximum value and thereafter decreased with further increase in crosslink density. X-ray Photoelectron Spectroscopy (XPS) and Pyrolysis Gas Chromatography-Mass Spectrometry (Py-GC/MS) analysis demonstrated that hydroxyl groups were formed and the additives migrated from inner to surface of NBR samples. In addition, the thermogravimetric analysis (TGA) indicated that the thermal stability of NBR did not significantly change in the accelerated thermal aging environment. |
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| Keywords: | Accelerated thermal aging Nitrile-butadiene rubber (NBR) Crosslink density Mechanical properties Chemical changes Thermogravimetric analysis |
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