Preceramic acetylenic polysilanes

Details Preceramic acetylenic polysilanes Preceramic acetylenic polysilanes

C - Chemistry, Metallurgy

08

G

25/133, 25/140,

C08G 77/60 (2006.01) C04B 35/56 (2006.01) C04B 35/571 (2006.01) C04B 35/622 (2006.01)

Patent

CA 1328656

PRECERAMIC ACETYLENIC POLYSILANES ABSTRACT Preceramic acetylenic polysilanes are described which contain -(CH2)wC?CR' groups attached to silicon where w is an integer from 0 to 3 and where R' 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'C?C(CH2)wMgX' where w is an integer from 0 to 3 and X' is chlorine, bromine, or iodine or an organolithium compound of general formula R'C?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.

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