The preparation of an uncrosslinked polysilazane containing chemically bound peroxide groups by reacting a polysilazane and a hydroperoxide at a temperature below the decomposition temperature of the hydroperoxide is disclosed. A thermoset polymer is formed by heating a peroxide-substituted silazane that is also substituted by alkenyl groups or alkynyl groups. The chemically bound peroxide decomposes to yield a free radical, thereby initiating crosslinking of the unsaturated groups. The peroxide-substituted polysilazanes can be pyrolyzed to form ceramic articles.
本发明公开了通过在低于
过氧化氢分解温度下使聚
硅氧烷和
过氧化氢反应制备含有
化学结合
过氧化氢基团的非交联聚
硅氧烷的方法。一种热固性聚合物是通过加热也被烯基或炔基取代的过氧化物取代的
硅氮烷形成的。
化学结合的过氧化物分解产生自由基,从而引发不饱和基团的交联。过氧化物取代的聚
硅氮烷可以热解形成陶瓷制品。