Title: Influence of DVB as linker molecule on the micropore formation in polymer-derived SiCN ceramics
Authors: Drechsel, Christina 
Peterlik, Herwig  
Gierl-Mayer, Christian  
Stöger-Pollach, Michael  
Konegger, Thomas  
Category: Original Research Article
Issue Date: 1-Feb-2021
Journal: Journal of the European Ceramic Society 
ISSN: 0955-2219
Abstract: 
In this work, the formation of transient microporosity during the polymer-to-ceramic conversion in polymer-derived ceramics was studied using a commercially available poly(vinyl)silazane precursor which was modified with divinylbenzene (DVB) as linker molecule during crosslinking. After pyrolysis treatments between 400 and 700 °C, the resulting materials not only showed distinct changes in elemental composition and structural features upon introduction of the linker molecule, but also a shift in micropore size, e.g. shifting from 0.84 nm to 0.70 nm after pyrolysis at 600 °C. Due to hindrance of transamination reactions in the low-temperature region, the nitrogen content in linker-containing samples was significantly higher, leading to a different composition of micropore-forming entities and, in case of the system studied, to smaller pores. These findings are a first step towards the clarification of the mechanisms leading to the pore formation in PDCs during pyrolytic conversion, which is essential for their use in prospective applications.
Keywords: Microporosity; Polymer-derived ceramics; Polysilazane; Preceramic polymers; Pyrolytic conversion
DOI: 10.1016/j.jeurceramsoc.2021.01.051
Organisation: E164-03-1 - Forschungsgruppe Anorganische Werkstoffe 
License: CC BY 4.0 CC BY 4.0
Publication Type: Article
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