期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 12, 页码 6733-6744出版社
AMER CHEMICAL SOC
DOI: 10.1021/am509129a
关键词
hyperbranched; polyborosilazanes; soluble polymeric precursors; SiBCN ceramics; high-temperature stability
资金
- Natural Science Foundation of China [21174112, 20874080, 51372202]
- Program for New Century Excellent Talents of the Education Ministry of China [NCET-11-0817]
High-temperature stable siliconborocarbonitride (SiBCN) ceramics produced from single-source preceramic polymers have received increased attention in the last two decades. In this contribution, soluble and meltable polyborosilazanes with hyperbranched topology (hb-PBSZ) were synthesized via a convenient solvent-free, catalyst-free and one-pot A(2) + B-6 strategy, an aminolysis reaction of the A(2) monomer of dichloromethylsilane and the B-6 monomer of tris(dichloromethylsilylethyl)borane in the presence of hexamethyldisilazane. The amine transition reaction between the intermediates of dichlorotetramethyldisilazane and tri(trimethylsilylmethylchlorosilylethyl)borane led to the formation of dendritic units of aminedialkylborons rather than trialkylborons. The cross-linked hb-PBSZ precursors exhibited a ceramic yield higher 80%. The resultant SiBCN ceramics with a boron atomic composition of 6.0-8.5% and a representative formula of Si1B0.19C1.21N0.39O0.08 showed high-temperature stability and retained their amorphous structure up to 1600 degrees C. These hyperbranched polyborosilazanes with soluble and meltable characteristics provide a new perspective for the design of preceramic polymers possessing advantages for high-temperature stable polymer-derived ceramics with complex structures/shapes.
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