Micro- and macropore-tailoring strategies in polysilazane-derived ceramic materials

Reference	Presenter	Authors (Institution)	Abstract
18-015	Thomas Konegger	Konegger, T.(TU Wien); Drechsel, C.(TU Wien); Prochaska, T.(TU Wien); Rauchenecker, J.(TU Wien);	Polymer-derived ceramics (PDC) present a vast playground for the generation of novel and alternatively structured ceramic materials, owing to the polymer nature of the preceramic starting compounds. The PDC approach allows for the exploration a completely new range of processing capabilitites when compared to conventional powder-based ceramic materials. The core of this talk aims towards presenting new strategies for the generation of tailored pore structures in PDC materials derived from preceramic polysilazanes, ranging from the micropore to the macropore domain. Various techniques employed during a current development of novel ceramic membranes are presented and discussed. First, a focus is set on the preparation of macroporous materials with high gas permeability, with prospective applicability as support material. Subsequently, emphasis is placed on the controlled generation of microporosity during the polymer-to-ceramic conversion process. Key factors responsible for micropore size and stability – including parameters during polymer cross-linking and during pyrolytic conversion – are discussed. Furthermore, the effects of chemical modifications of the precursor compound on the resulting material structure and composition are shown. The processing strategies discussed represent straightforward approaches towards structured materials suitable for operation in demanding environments, e.g. under harsh chemical and thermal conditions.
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