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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/68081723:_____/15:00443898 RIV/67985891:_____/15:00443898

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP107%2F12%2F2445" target="_blank" >GAP107/12/2445: SiOC keramická pěna z pyrolyzovaného polymerního prekurzoru jako jádro tepelně odolných sendvičových struktur</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Ceramics International

ISSN

0272-8842

e-ISSN

—

Svazek periodika

41

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

8402-8410

Kód UT WoS článku

000355711700017

EID výsledku v databázi Scopus

2-s2.0-84929281202