| 摘要 |
<p>Preceramic acetylenic polysilanes are described which contain -(CH2)wC IDENTICAL CR min groups attached to silicon where w is an integer from 0 to 3 and where R min is hydrogen, an alkyl radical containing 1 to 6 carbon atoms, a phenyl radical, or an -SiR'''3 radical wherein R''' is an alkyl radical containing 1 to 4 carbon atoms. The acetylenic polysilanes are prepared by reacting chlorine- or bromine-containing polysilanes with either a Grignard reagent of general formula R min C IDENTICAL C(CH2)wMgX min where w is an integer from 0 to 3 and X min is chlorine, bromine, or iodine or an organolithium compound of general formula R min C IDENTICAL C(CH2)wLi where w is an integer from 0 to 3. The acetylenic polysilanes can be converted to ceramic materials by pyrolysis at elevated temperatures under an inert atmosphere.</p> |
