Počet záznamů: 1
Preparation of finely macroporous SiOC foams with high mechanical properties and with hierarchical porosity via pyrolysis of a siloxane/epoxide composite
- 1.
SYSNO ASEP 0443898 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Preparation of finely macroporous SiOC foams with high mechanical properties and with hierarchical porosity via pyrolysis of a siloxane/epoxide composite Tvůrce(i) Strachota, Adam (UMCH-V) RID, ORCID
Černý, Martin (USMH-B) RID, ORCID, SAI
Chlup, Zdeněk (UFM-A) RID, ORCID
Rodzen, Krzysztof (UMCH-V)
Depa, Katarzyna (UMCH-V)
Halasová, Martina (UFM-A)
Šlouf, Miroslav (UMCH-V) RID, ORCID
Schweigstillová, Jana (USMH-B) RID, ORCID, SAIZdroj.dok. Ceramics International. - : Elsevier - ISSN 0272-8842
Roč. 41, č. 7 (2015), s. 8402-8410Poč.str. 9 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova silicon oxycarbide ; foams ; pyrolysis Vědní obor RIV JH - Keramika, žáruvzdorné materiály a skla Vědní obor RIV – spolupráce Ústav struktury a mechaniky hornin - Kompozitní materiály
Ústav fyziky materiálu - Únava materiálu a lomová mechanikaCEP GAP107/12/2445 GA ČR - Grantová agentura ČR Institucionální podpora UMCH-V - RVO:61389013 ; USMH-B - RVO:67985891 ; UFM-A - RVO:68081723 UT WOS 000355711700017 EID SCOPUS 84929281202 DOI 10.1016/j.ceramint.2015.03.037 Anotace 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 be 10 GPa. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2016
Počet záznamů: 1