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US4939222A Boron/nitrogen preceramic polymers and boron nitride ceramic materials produced therefrom 失效
硼/氮预陶瓷聚合物和由其制备的氮化硼陶瓷材料

Boron/nitrogen preceramic polymers and boron nitride ceramic materials
produced therefrom
摘要:
Crosslinked boron/nitrogen preceramic polymers are prepared by reacting (a) admixture of a trihalogenoborane A and a compound B containing at least one dihalogenated boron atom, with (b) an amino compound C containing at least one --NH.sub.2 group; the resulting polymers are facilely pyrolyzed into boron nitride ceramic materials.
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