Micromechanical assessment of PMMA microcapsules containing epoxy and mercaptan as self-healing agents |
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| Institution: | 1. Department of Applied Chemistry, Malek-ashtar University of Technology, Isfahan, 83145/115, Iran;2. Department of Chemical Engineering, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands;3. Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, 81746-73441, Iran;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: | Mechanical properties of microcapsule shell have great influence on microcapsule suitability as a mechanical trigger in a self-healing composite. The elastic modulus and hardness of polymethyl methacrylate (PMMA) microcapsules containing epoxy prepolymer (EC 157) and pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) as healing agents were investigated using nanoindentation technique. The influence of the PMMA average molecular weight (MW), the kind of core material, and the mechanical mixing rate on the mechanical properties of the microcapsule shell were studied using the Taguchi experimental design approach. The results indicated that the most important factors which affect the elastic modulus and the hardness of microcapsules shell are the Mw of PMMA and the kind of core material. The average elastic modulus of PMMA shell of epoxy and mercaptan-loaded microcapsules was found between 2.386 and 3.495 GPa. The hardness of PMMA shell of healing agent microcapsules was obtained in the range of 0.064–0.219 GPa. This constitutes essential knowledge in order to design capsules with tailored properties for self-healing materials. |
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| Keywords: | Elastic modulus Hardness Healing agent Nanoindentation Microcapsule |
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