Synthesis and characterization of polyaluminocarbosilane as SiC ceramic precursor^①

来源期刊：中国有色金属学报(英文版)2004年第4期

论文作者：余煜玺 李效东 曹峰 冯春祥

文章页码：641 - 644

Key words：precursor; polyaluminocarbosilane; synthesis; characterization

Abstract: Polyaluminocarbosilane(PACS) was synthesized by the reaction of aluminum acetylacetonate (Al(AcAc)₃)with polysilacarbosilane (PSCS), which was prepared by thermolysis and condensation of polydimethylsilane (PDMS).The sublimation of Al(AcAc)₃could be avoided by the use of PSCS as reactant. The empirical formula of PACS was SiC₂.₀₁H_7.66O_0.13Al_0.02, which has the relative molecular mass of 2 265. When the reaction of PSCS with Al(AcAc)₃ proceeds, an enormous decrease in the number of Si—H bonds in PSCS is observed, at the same time, gas acetylacetonate is a by-product of the reaction based on the ligands of Al(AcAc)3. The reaction mechanism is found to be related to the increase in the molecular mass of PACS by the cross-linking reaction of Si—H bonds in PSCS with Al(AcAc)₃, which leads to the formation of Si—Al bonds.

基金信息：the National Natural Science Foundation of China