Chemical ageing effects on the mechanical behaviour of ethylene-propylene diene monomer |
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| Institution: | 1. School of Engineering, Trinity College Dublin, College Green, Dublin 2, Ireland;2. Centre for Innovative Human Systems, Trinity College Dublin, College Green, Dublin 2, Ireland;1. LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, 4051381 Concepción, Chile;2. Department of Mechanical Engineering, University of the Basque Country, 48013 Bilbao, Spain;1. Department of Forestry and Wood Technology, Faculty of Technology, Linnaeus University, Lückligs Plats 1, 35195 Växjö, Sweden;2. Czech Technical University in Prague, Faculty of Civil Engineering, Department of Building Structures, Thákurova 7, 166 29 Prague 6, Czech Republic;3. Slovenian National Building and Civil Engineering Institute, Dimičeva 12, SI-1000 Ljubljana, Slovenia;4. Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia;5. University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Jamnikarjeva, 101, 1000 Ljubljana, Slovenia;3. Department of Civil Engineering, Federal University of São Carlos – UFSCar, São Carlos, São Paulo, Brazil |
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| Abstract: | Ethylene-propylene diene monomer (EPDM) elastomer diaphragm failures due to material degradation pose a major risk in the biopharmaceutical industry, as they can result in long periods of production downtime. It is suspected that a key cause of this EPDM degradation is due to the chemical solutions used in equipment cleaning processes. However this has never been empirically investigated in the public domain. Twenty four virgin samples were utilised for testing, twelve of which were subject to common chemical cleaning solutions used in the biopharmaceutical sector. The chemical solutions under investigation were aqueous solutions of NaOH, NaClO, H3PO4, and the interaction between 100 °C H2O and NaClO. The characterisation of the degradation process was conducted by mechanical testing. The results show that degradation of the polymer bulk proceeds predominantly via crosslinking for all exposure types. NaOH and H3PO4 exposure results in an accelerated rate of crosslinking compared to NaClO in the early stages of exposure. |
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| Keywords: | Ethylene-propylene diene monomer (EPDM) Ageing Chemical degradation Mechanical properties Biopharmaceutical production |
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