Počet záznamů: 1
In-situ measurement of mechanical properties and dimensional changes of preceramic thermosets during their pyrolysis conversion to ceramics using thermomechanical analysis
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SYSNO ASEP 0545846 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název In-situ measurement of mechanical properties and dimensional changes of preceramic thermosets during their pyrolysis conversion to ceramics using thermomechanical analysis Tvůrce(i) Černý, Martin (USMH-B) RID, ORCID, SAI
Chlup, Zdeněk (UFM-A) RID, ORCID
Strachota, Adam (UMCH-V) RID, ORCID
Brus, Jiří (UMCH-V) RID, ORCID
Schweigstillová, Jana (USMH-B) RID, ORCID, SAI
Rýglová, Šárka (USMH-B) RID, ORCID, SAI
Bičáková, Olga (USMH-B) RID, ORCID, SAICelkový počet autorů 7 Zdroj.dok. Ceramics International. - : Elsevier - ISSN 0272-8842
Roč. 47, č. 16 (2021), s. 23285-23294Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Thermomechanical analysis ; Preceramic polymer ; Pyrolysis ; Polysiloxane ; Rheology Vědní obor RIV JH - Keramika, žáruvzdorné materiály a skla Obor OECD Ceramics Vědní obor RIV – spolupráce Ústav makromolekulární chemie - Makromolekulární chemie
Ústav fyziky materiálu - Keramika, žáruvzdorné materiály a sklaCEP GA17-12546S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora USMH-B - RVO:67985891 ; UFM-A - RVO:68081723 ; UMCH-V - RVO:61389013 UT WOS 000674586000004 EID SCOPUS 85106388829 DOI 10.1016/j.ceramint.2021.05.041 Anotace The study deals with the thermomechanical analysis of the pyrolysis process of four structurally different types of cross-linked preceramic polymers: methylsiloxane, methyl-phenyl-siloxane, hydrosilylation cured methylphenyl-siloxane and phenol-formaldehyde resins. During the transformation of polymer to ceramics by pyrolysis, the investigated polymeric materials undergo significant softening and subsequent hardening, which are accompanied by considerable dimensional changes, but crosslinking of the thermoset microstructure greatly limits stress relaxation by plastic deformation. The parallel action of these processes leads to a high risk of cracking at certain temperatures, which is the biggest problem of preceramic polymer technology. To analyse these processes in detail an in-situ thermomechanical experiment using cyclic indentation method was chosen, where a flat-ended cylinder was used as an indenter. To characterize the rheological behaviour development during pyrolysis, a cyclic loading with a trapezoidal pulse with a period of 120 s was applied. Due to the risk of cracking, the experiments were performed at very low applied loads and heating rates. These experiments made it possible to obtain simultaneous temperature characteristics of elastic, viscoelastic and residual deformations as well as overall pyrolysis shrinkage. The acquired results thus provide a comprehensive insight into the gradual changes in mechanical behaviour and volume changes during the thermal transformation of thermosets. A model of the thermomechanical and rheological response on the indentation during pyrolysis was developed to analyse deeply obtained TMA data. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2022 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0272884221014267
Počet záznamů: 1