A construction kit for Si-B-C-N ceramic materials based on borazine precursors
A construction kit for Si-B-C-N ceramic materials based on borazine precursors
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DOI：
10.1021/cm047820l
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发表时间：
2005-05-03
影响因子：
8.6
通讯作者：
Grützmacher, H
中科院分区：
文献类型：
--
作者：
Haberecht, J;Nesper, R;Grützmacher, H
从B，B '，B”-三乙炔基环硼氮烷（1）出发，提出了一种制备高耐久性Si-B-C-N陶瓷材料的简便方法。使用Pt/C作为催化剂，1与HSiRCl 2（R = Cl，Me，Ph）的氢化硅烷化产生新的前体分子2和3。随后与MeNH 2的连接反应或与LiAlH 4的氢化导致陶瓷前体4-6。所有的化合物和聚合物已经通过NMR和IR光谱和质谱进行了表征。4-6的热转化产生具有可调Si、C和N含量的各种Si-B-C-N陶瓷C8-C10。通过热分析和红外光谱分析，对热解机理进行了深入研究。材料的化学组成由反应途径以及相应前体分子的主链控制。
Starting from B,B',B"-triethynylborazine (1), an easy construction kit for highly durable Si-B-C-N ceramic materials is presented. Hydrosilylation of 1 with HSiRCl2 (R = Cl, Me, Ph) using Pt/C as catalyst results in the novel precursor molecules 2 and 3. Subsequent linking reactions with MeNH2 or hydrogenation with LiAlH4 leads to the preceramic precursors 4-6. All compounds and polymers have been characterized by NMR and IR spectroscopy and mass spectrometry. The thermal conversion of 4-6 results in various Si-B-C-N ceramics, C8-C10, with tunable Si, C, and N content. Insights into the mechanism of the pyrolysis have been obtained by thermal analysis as well as IR spectroscopy. The chemical composition of the materials is controlled by the reaction pathway as well as by the backbone of the respective precursor molecules.