Organosilicon polymers with bis‐acetylenic units: Conductivity and ceramisation studies

The transformation poly[(silylene)diacetylene] into ceramic have been studied and SiC obtained with a quantitative yield: all the silicon atoms present in the starting material are converted into SiC. The key step is the crosslinkage of C 4 units into a carbon matrix in which the R 1 SiR 2 moieties are in the vicinity one to each other allowing the quantitative transformation into SiC. The carbon content of the resulting ceramic depends on the nature of R 1 and R 2 groups. The excess of carbon has been used for the carboreduction of oxides (TiO 2 , ZrO 2 , HfO 2 , etc…) and mixed ceramics with interpenetrating network have been obtained: SiC / TiC, SiC / ZrC, etc… Under nitrogen atmosphere, the ceramisation leads to different systems such as SiC / TiN, SiC / AlN, etc…