Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics
Polysiloxane networks were prepared by hydrosilylation of poly(methylvinylsiloxane) (V<sub>3</sub> polymer) with 1,3,5,7-tetramethylcyclotetrasiloxane (D<sub>4</sub><sup>H</sup>) at various Si-Vinyl: Si-H groups molar ratios in water-in-oil high internal phase emu...
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MDPI AG
2021-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/19/5661 |
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| author | Jan Mrówka Janusz Partyka Magdalena Hasik |
| author_facet | Jan Mrówka Janusz Partyka Magdalena Hasik |
| author_sort | Jan Mrówka |
| collection | DOAJ |
| description | Polysiloxane networks were prepared by hydrosilylation of poly(methylvinylsiloxane) (V<sub>3</sub> polymer) with 1,3,5,7-tetramethylcyclotetrasiloxane (D<sub>4</sub><sup>H</sup>) at various Si-Vinyl: Si-H groups molar ratios in water-in-oil high internal phase emulsion (HIPE). Curing the emulsions followed by removal of water led to foamed cross-linked polysiloxane systems differing in the cross-linking degrees, as well as residual Si-H and Si-Vinyl group concentrations. Treatment of thus obtained materials in Pd(OAc)<sub>2</sub> solution in tetrahydrofuran resulted in the formation of porous palladium/polymer nanocomposites with different Pd contents (1.09–1.70 wt %). Conducted investigations showed that pyrolysis of the studied materials at 1000 °C in argon atmosphere leads to porous Si-C-O and Si-C-O/Pd ceramics containing amorphous carbon and graphitic phases. Thermogravimetric (TG) analysis of the starting cross-linked polymer materials and those containing Pd nanoparticles revealed that the presence of palladium deteriorates thermal stability and decreases ceramic yields of preceramic networks. The extent of this effect depends on polymer cross-linking density in the system. |
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| format | Article |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:57:16Z |
| publishDate | 2021-09-01 |
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| series | Materials |
| spelling | doaj.art-bd084a8370b642649bc03fab706d81802023-11-22T16:25:10ZengMDPI AGMaterials1996-19442021-09-011419566110.3390/ma14195661Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd CeramicsJan Mrówka0Janusz Partyka1Magdalena Hasik2Department of Silicate Chemistry and Macromolecular Compounds, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, PolandDepartment of Ceramics and Refractory Materials, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, PolandDepartment of Silicate Chemistry and Macromolecular Compounds, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, PolandPolysiloxane networks were prepared by hydrosilylation of poly(methylvinylsiloxane) (V<sub>3</sub> polymer) with 1,3,5,7-tetramethylcyclotetrasiloxane (D<sub>4</sub><sup>H</sup>) at various Si-Vinyl: Si-H groups molar ratios in water-in-oil high internal phase emulsion (HIPE). Curing the emulsions followed by removal of water led to foamed cross-linked polysiloxane systems differing in the cross-linking degrees, as well as residual Si-H and Si-Vinyl group concentrations. Treatment of thus obtained materials in Pd(OAc)<sub>2</sub> solution in tetrahydrofuran resulted in the formation of porous palladium/polymer nanocomposites with different Pd contents (1.09–1.70 wt %). Conducted investigations showed that pyrolysis of the studied materials at 1000 °C in argon atmosphere leads to porous Si-C-O and Si-C-O/Pd ceramics containing amorphous carbon and graphitic phases. Thermogravimetric (TG) analysis of the starting cross-linked polymer materials and those containing Pd nanoparticles revealed that the presence of palladium deteriorates thermal stability and decreases ceramic yields of preceramic networks. The extent of this effect depends on polymer cross-linking density in the system.https://www.mdpi.com/1996-1944/14/19/5661polysiloxanespolymer-derived ceramicssilicon oxycarbidepolyHIPE |
| spellingShingle | Jan Mrówka Janusz Partyka Magdalena Hasik Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics Materials polysiloxanes polymer-derived ceramics silicon oxycarbide polyHIPE |
| title | Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics |
| title_full | Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics |
| title_fullStr | Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics |
| title_full_unstemmed | Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics |
| title_short | Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics |
| title_sort | porous materials based on poly methylvinylsiloxane cross linked with 1 3 5 7 tetramethylcyclotetrasiloxane in high internal phase emulsion as precursors to si c o and si c o pd ceramics |
| topic | polysiloxanes polymer-derived ceramics silicon oxycarbide polyHIPE |
| url | https://www.mdpi.com/1996-1944/14/19/5661 |
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