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

摘要

AbstractThe 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 C4units into a carbon matrix in which the R1SiR2moieties 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 R1and R2groups. The excess of carbon has been used for the carboreduction of oxides (TiO2, ZrO2, HfO2, 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,