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首页> 美国政府科技报告 >Transition-Metal-Catalyzed Polymerization of Silazanes as a Route to the Preparation of Silicon-Carbide-Nitride Fibers. Advanced Methods for the Preparation of Preceramic Polymers and Their Transformation into Silicon Nitride Fibe
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Transition-Metal-Catalyzed Polymerization of Silazanes as a Route to the Preparation of Silicon-Carbide-Nitride Fibers. Advanced Methods for the Preparation of Preceramic Polymers and Their Transformation into Silicon Nitride Fibe

机译：过渡金属催化的硅氮烷聚合作为制备碳化硅 - 氮化物纤维的途径。先进陶瓷聚合物制备及其向氮化硅纤维转变的先进方法

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The primary goal for both projects is to develop synthetic routes to tractable preceramic polysilazanes that can be spun into preceramic fibers and pyrolytically transformed into silicon nitride or silicon carbide-nitride fibers based on novel catalytic processes discovered at SRI. The research program is divided into three separate Tasks. Our efforts, in the first task, are directed towards optimizing the polymer synthesis process(es) through detailed studies of the kinetics and mechanisms of the catalytic reaction(s) that promote polymer formation. Research in the second task focusses on rheological characterization of polymers produced in the first task and development and refinement of polymer spinning procedures. The third task efforts are concerned with optimizing the process whereby the polysilazanes produced in Task 1 and shaped in Task 2 are pyrolytically transformed into ceramic materials and the characterization of the ceram ic products. In the course of our studies, we have detailed the kinetics and mechanisms of the transition metal catalyzed cleavage of bonds and the dehydrocoupling process whereby silicon nitrogen bonds are formed from silicon nitrogen and nitrogen hydrogen bonds using simple model systems. We have identified ruthenium as the best catalyst for dehydrocoupling following a survey of potential transition metal catalysts.

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