Drechsel, C., Peterlik, H., Gierl-Mayer, C., Stöger-Pollach, M., & Konegger, T. (2021). Influence of DVB as linker molecule on the micropore formation in polymer-derived SiCN ceramics. Journal of the European Ceramic Society, 41(6), 3292–3302. https://doi.org/10.1016/j.jeurceramsoc.2021.01.051
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.
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Mikroporenentwicklung in polymerabgeleiteten Keramiken
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