Si-O-C ceramic foams derived from polymethylphenylsiloxane precursor with starch as foaming agent

0448254 - ÚSMH 2016 RIV GB eng J - Journal Article
Černý, Martin - Chlup, Zdeněk - Strachota, Adam - Svítilová, Jaroslava - Schweigstillová, Jana - Halasová, Martina - Rýglová, Šárka
Si-O-C ceramic foams derived from polymethylphenylsiloxane precursor with starch as foaming agent.
Journal of the European Ceramic Society. Roč. 35, č. 13 (2015), s. 3427-3436. ISSN 0955-2219. E-ISSN 1873-619X
R&D Projects: GA ČR GAP107/12/2445
Institutional support: RVO:67985891 ; RVO:68081723 ; RVO:61389013
Keywords : pyrolysis * ceramic foam * precursor * starch * Si-O-C
Subject RIV: JI - Composite Materials; JH - Ceramics, Fire-Resistant Materials and Glass (UFM-A)
Impact factor: 2.933, year: 2015

Si-O-C ("black glass") ceramic foam was prepared by the foaming of a preceramic polymer, polymethylphenylsiloxane resin, and by its subsequent pyrolysis conducted up to 1000 degrees C. Prior to foaming, corn starch was blended with the diluted resin, in order to achieve uniform and small-sized pores. The foaming of the polymer blend was carried out simultaneously with its crosslinldng: escaping water vapour (forming from starch) served as the blowing agent. The apparent foam density can be controlled by adjusting the foaming temperature or by varying the amount of added starch. Both ways were used to prepare foam samples with porosity in the range of 70-90%. The porosity-dependent compressive strength of these foams was found to be in the range of 1-16 MPa. (C) 2015 Elsevier Ltd. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0250007