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

SYSNO ASEP	0443898
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Preparation of finely macroporous SiOC foams with high mechanical properties and with hierarchical porosity via pyrolysis of a siloxane/epoxide composite
Author(s)	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, SAI}
Source Title	Ceramics International. - : Elsevier - ISSN 0272-8842 Roč. 41, č. 7 (2015), s. 8402-8410
Number of pages	9 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	silicon oxycarbide ; foams ; pyrolysis
Subject RIV	JH - Ceramics, Fire-Resistant Materials and Glass
Subject RIV - cooperation	Institute of Rock Structure and Mechanics - Composite Materials Institute of Physics of Materials - Materials Fatigue, Friction Mechanics
R&D Projects	GAP107/12/2445 GA ČR - Czech Science Foundation (CSF)
Institutional support	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
Annotation	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.
Workplace	Institute of Macromolecular Chemistry
Contact	Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
Year of Publishing	2016

Number of the records: 1