Number of the records: 1
Foaming of polysiloxane resins with ethanol: a new route to pyrolytic macrocellular SiOC foams
- 1.
SYSNO ASEP 0447628 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Foaming of polysiloxane resins with ethanol: a new route to pyrolytic macrocellular SiOC foams Author(s) Strachota, Adam (UMCH-V) RID, ORCID
Černý, Martin (USMH-B) RID, ORCID, SAI
Chlup, Zdeněk (UFM-A) RID, ORCID
Depa, Katarzyna (UMCH-V)
Šlouf, Miroslav (UMCH-V) RID, ORCID
Sucharda, Zbyněk (USMH-B)Source Title Ceramics International. - : Elsevier - ISSN 0272-8842
Roč. 41, č. 10 Part A (2015), s. 13561-13571Number of pages 11 s. Language eng - English Country GB - United Kingdom Keywords silicon oxycarbide ; siloxane ; foams Subject RIV JI - Composite Materials Subject RIV - cooperation Institute of Rock Structure and Mechanics - Ceramics, Fire-Resistant Materials and Glass
Institute of Physics of Materials - Materials Fatigue, Friction MechanicsR&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 000362860900129 DOI 10.1016/j.ceramint.2015.07.151 Annotation Polysiloxane foams as precursors to silicon oxycarbide (SiOC) foams were prepared via simultaneous cure and foaming of liquid methylsiloxane resins, using the relatively environment-friendly ethanol as blowing additive of the boiling-solvent-type, and concentrated aqueous ammonia as catalyst. In order to achieve foam regularity, siloxane-based surfactants were added, and bubble nucleation by mechanical stirring was performed. The precursor foams were subsequently pyrolysed in nitrogen at 1000 °C, yielding SiOC foams as end products. The properties of the latter were fine-tuned during the foaming of the precursors, by the amount of added ethanol and by the time of mechanical stirring prior to foaming. The so-obtained SiOC foams displayed densities of 0.17–0.42 g/cm−3, corresponding to macro-porosities of 91–79%, compressive strength of 1–6 MPa, and elastic moduli of 0.2–1.6 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