The role of microstructure on the mechanical properties of polyurethane foams containing thermoregulating microcapsules |
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| Affiliation: | 1. Institute of Chemical and Environmental Technologies, Department of Chemical Engineering, University of Castilla – La Mancha, Av. Camilo José Cela s/n, 13004 Ciudad Real, Spain;2. School of Architecture, Department of Mechanical Engineering, University of Castilla – La Mancha, Av. Carlos III s/n, 45071 Toledo, Spain;1. Center for Advanced Materials, Qatar University, PO Box 2713, Doha, Qatar;2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovského nám. 2, 162 06 Praha, Czechia;1. Institute for Problems of Chemical and Energetic Technologies, Siberian Branch of the Russian Academy of Sciences (IPCET SB RAS), Biysk 659322, Altai Krai, Russia;2. N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences (NIOCh SB RAS), Novosibirsk 630090, Russia;3. OOO Elektromash, Novosibirsk, 630088 Russia;1. Institute of Fundamental Technological Research, PAS, Warsaw, Poland;2. Institute of Materials Science, University of Silesia, Katowice, Poland;3. Aichi Institute of Technology, Toyota-city, Japan;4. SMP Technologies Inc., Tokyo, Japan |
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| Abstract: | Rigid polyurethane foams with up to 50 wt% of microcapsules from LDPE-EVA containing Rubitherm®RT27 were synthesized. The influence of microcapsules on the foams density, microstructure and mechanical resistance was studied. Cell size and strut and wall thicknesses were analyzed by SEM. The relationships between densities and foam microstructures with their Young's moduli and collapse stress were found by the Gibson and Ashby formulations and the Kerner equation for mechanical properties of composites. It was found a cell structure change from polyhedral closed-cells to spherical or amorphous open-cells. A good agreement between the experimental and theoretical data was observed but requiring a cell form factor. Thus, Fitting parameters confirmed the high trend of these microcapsules to be incorporated into the foam cell walls and the form factors depicted the abrupt change of cell morphology. Thus, these equations are suitable for predicting the mechanical properties of foams containing fillers of low mechanical resistance. |
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| Keywords: | Phase change materials Polyurethane foams SEM Mechanical properties Physical properties |
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