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Tailoring the Morphology of Microcellular Polymer Foams
Nistor, A. ; Rygl, A. ; Sajfrtová, Marie ; Toulec, M. ; Vonka, M. ; Kosek, J.
In this work, we focus on polymer foams with improved heat and/or sound insulation properties, in particular on microcellular foams with the cell sizes below 10 μm. By decreasing the cell size below 10 μm or even lower we can highly improve the foam heat and sound insulation properties. Depending on the foam structure (open-, closed-cell or dentritic) the foam application can vary. The structure-property relation is thus of great interest as well as the preparation of foams with various morphologies and scale-up of the manufacturing of microcellular foams.
Plný tet: 115_nistor -  PDF
Plný text: content.csg - PDF
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Preparation and Characterization of Micro- and Nanocellular Polystyrene Foams
Nistor, A. ; Rygl, A. ; Sajfrtová, Marie ; Bobák, M. ; Kosek, J.
Polystyrene foams with closed cells were prepared using supercritical CO2 as the blowing agent. On the other hand, polystyrene foams with open cells were prepared via temperature induced phase separation, namely by the spinodal decomposition. In both cases, we systematically studied the influence of the foaming conditions (focusing especially on nucleation and coalescence) on the final foam morphology. The influence of solvent residua on foaming was discussed in. By carefully optimizing the foaming conditions we prepared foams with an average cell size below 1 μm. Furthermore, we studied the heat insulation properties of the prepared foams and compared them with the results of heat transport simulation in foams.
Plný tet: SKMBT_C22014090110372 - PDF
Plný text: content.csg - PDF
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Micro- and Nanocellular Polymer Foams – Insulation Material of the Future
Nistor, A. ; Rygl, A. ; Bobak, M. ; Sajfrtová, Marie ; Kosek, J.
In the polymer foam industry, emphasis is placed on improving foam properties and making the production process more sustainable and ecological. By reducing the cell size of polymer foams below tens of micrometres we can improve their heat insulation properties and save material. Such polymer foams are called micro- or nanocellular foams depending on the range of their cell size. Micro- and nanocellular foams can be prepared by pressure induced foaming with high pressure CO2. We studied the influence of the foaming conditions on the final foam structure with the aim of achieving the cell sizes as small as possible, having a narrow cell size distribution and reaching the bulk porosity above 90 %. The foam morphology was analysed by Scanning Electron Microscopy and Atomic Force Microscopy. Some morphology visualisations were also made by X-ray micro-tomography, but these visualisations are not demonstrated in this contribution.
Plný tet: SKMBT_C22013102415151 - PDF
Plný text: content.csg - PDF
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