Preparation of finely macroporous SiOC foams with high mechanical properties and with hierarchical porosity via pyrolysis of a siloxane/epoxide composite

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F15%3A00443898" target="_blank" >RIV/61389013:_____/15:00443898 - isvavai.cz</a>
Alternative codes found
RIV/68081723:_____/15:00443898 RIV/67985891:_____/15:00443898
Result on the web
<a href="http://dx.doi.org/10.1016/j.ceramint.2015.03.037" target="_blank" >http://dx.doi.org/10.1016/j.ceramint.2015.03.037</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ceramint.2015.03.037" target="_blank" >10.1016/j.ceramint.2015.03.037</a>

Result language
angličtina
Original language name
Preparation of finely macroporous SiOC foams with high mechanical properties and with hierarchical porosity via pyrolysis of a siloxane/epoxide composite
Original language description
Mechanically strong SiOC foams were prepared via pyrolysis of polysiloxane composites, into which 20?70 wt% of epoxy powder were incorporated as sacrificial filler. The chosen epoxy filler degrades practically quantitatively during the pyrolysis in nitrogen, due to a high content of polyoxypropylene chains. The pyrolysis of the composite precursors yielded SiOC foams with apparent densities between 1.31 and 0.62 g/cm3, which corresponded to macro-porosities of 35?69%. A hierarchical porosity was obtained due to a relatively wide distribution of the sacrificial filler grains size. Compressive strength between 15 and 38 MPa was achieved, depending on the apparent density of the SiOC foams: the best result was obtained for the foam with 56% porosity. In the case of denser foams, their strength was reduced by the presence of pyrolysis cracks, while at 70% porosity, the thinner pore walls led to a reduced strength. The elastic modulus of the most promising foam (56% porosity) was found to b
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JH - Ceramics, fire-proof materials and glass
OECD FORD branch
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Project
<a href="/en/project/GAP107%2F12%2F2445" target="_blank" >GAP107/12/2445: SiOC ceramic foam from pyrolyzed polymer precursor as a core of thermally stable composite sandwich structures</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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