Journal
ADVANCED ENGINEERING MATERIALS
Volume 14, Issue 12, Pages 1097-1103Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201200039
Keywords
carbon dioxide foaming; graded porosity; polymer derived cellular ceramics
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Funding
- DFG Cluster of Excellence Engineering of Advanced Materials'' at the University of Erlangen-Nuernberg
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Cylindrical SiOC foam filaments with a radial gradient in pore cell size were processed by continuous extrusion foaming of a methyl polysilsesquioxane. Upon leaving the extrusion nozzle foaming was initiated by pressure release which caused precipitation of supersaturated carbon dioxide from the polymer filament. Rapid cooling of the thin filaments generates a radial gradient of melt viscosity which gives rise for formation of closed cell morphology of isotropic pore cells in the core (diameter?
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