Mechanical characterization of nanoclay-filled PDMS thin films |
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| Affiliation: | 1. Department of Mining and Materials Engineering, McGill University, Montreal, Quebec, H3A 0C5, Canada;2. Department of Mechanical and Materials Engineering, Western University, London, Ontario, N6A 5B9, Canada;1. Key Laboratory of Special Functional Aggregated Materials & Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China;2. School of Materials Science & Engineering, Shandong Jiaotong University, Jinan 250357, PR China;1. Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, PR China;2. Key Laboratory of Eco-Textiles, Ministry of Education, School of Textiles and Clothing, Jiangnan University, Wuxi, Jiangsu 214122, PR China;1. KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Surface and Corrosion Science, Drottning Kristinas väg 51, SE-100 44, Stockholm, Sweden;2. KTH Royal Institute of Technology, Nanostructure Physics, Roslagstullsbacken 21, SE-106 91, Stockholm, Sweden;3. SP Technical Research Institute of Sweden, SP Chemistry, Materials and Surfaces, Box 5607, SE-114 86, Stockholm, Sweden |
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| Abstract: | Polydimethylsiloxane (PDMS) reinforced by nanoclay platelets exhibits excellent mechanical properties for microfluidic systems. We tested PDMS-clay nanocomposite thin films under flat-ended cylindrical indentation and measured the elastic modulus and shear strength. A simple formulation based on a shear-lag model, fed by numerical simulations, was introduced to estimate the interfacial shear strength of thin films. Increase in the nanoclay content improved the elasticity of PDMS-clay thin films but reduced their interfacial shear strength. Shear thinning behavior of nanoclay platelets probably reduced the strength of PDMS nanocomposites. The proposed approach can be used for characterization of any polymeric thin films. |
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| Keywords: | PDMS Nanoclay Flat-ended indentation Interfacial shear strength |
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