Low temperature design of polymer-derived hexagonal boron nitride

Reference Presenter Authors
18-053 Samuel Bernard Bernard, S.(Institut de Recherche sur les Céramiques); Lale, A.(Institut de Recherche sur les Céramiques); Boron nitride (BN) is a III-V compound which is the focus of important research since its discovery in the early 19th century. BN is electronic to carbon and thus, in the same way that carbon exists as graphite, BN exists in the hexagonal phase. The latter offers an unusual combination of properties that cannot be found in any other ceramics. However, these properties closely depend on the synthesis processes. The precursor route allows preparing complex BN shapes which cannot be obtained by conventional process. In particular, we will report in the first part of this presentation, the preparation of mesoporous BN monoliths using polyborazylene as a precursor. Such materials can be used to store hydrogen. However, the controlled synthesis of precursor-derived hexagonal BN with a high degree of crystallization is a big challenge, and making full use of these materials in applications still requires great effort. In the second part of this presentation, we will focus on the chemical modification of BN precursors to form highly crystallized BN at relatively low temperature with particular attentions on the chemistry and processing behind the process and the high temperature behavior.
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