Polymeric routes to silicon carbide

British Polymer Journal Pub Date : 1986-11-01 DOI:10.1002/PI.4980180602

C. L. Schilling

引用次数: 39

Abstract

Several classes of organosilicon polymers are effective precursors for silicon carbide ceramic compositions. These include polydimethylsilane (via a two-step process), ‘polysilastyrene’, polycarbosilazanes or polysilazanes, and certain siloxanes, plus the branched polycarbosilanes, branched polysilahydrocarbons, and vinylic polysilanes developed at Union Carbide. The latter three classes are prepared by active metal dechlorinations of appropriate chlorosilane blends, leading to recognition of branching at backbone silicon atoms (either as prepared or during processing) as a prerequisite for obtaining useful ceramic yields. Fundamental reactivity differences between the active metals (potassium and sodium) allow the preparation of sodium-derived vinylic polysilanes. The latter offer certain economic and performance advantages as ceramic precursors.

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合成碳化硅的聚合途径

几种有机硅聚合物是碳化硅陶瓷组合物的有效前驱体。这些产品包括聚二甲基硅烷(通过两步法)、聚硅氧烷、聚碳硅烷或聚硅烷、某些硅氧烷，以及联合碳化物公司开发的支化聚碳硅烷、支化聚硅烃和乙烯基聚硅烷。后三类是通过适当的氯硅烷共混物的活性金属脱氯制备的，导致识别主硅原子上的分支(无论是在制备时还是在加工过程中)，这是获得有用陶瓷产量的先决条件。活性金属(钾和钠)之间的基本反应性差异允许制备钠衍生的乙烯基聚硅烷。后者作为陶瓷前驱体具有一定的经济和性能优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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British Polymer Journal

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