C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
25/128, 402/17
C08L 83/16 (2006.01) C04B 35/58 (2006.01) C08G 77/60 (2006.01)
Patent
CA 1304875
ABSTRACT A method for preparing preceramic polymers is disclosed. This method includes the steps of reacting in solution anhydrous ammonia with a mixture of R1SiHX2 (where R1 and X are as described above) and R2SiX3 (where R2 as described above) can be used to form a different and useful preceramic polymer by reacting it with an organosilicon polymer containing Si-H repeat units. The Si-H containing organosilicon polymer is preferably selected from the group consisting of organopolysilanes of the formula [(RSiH)X(RSi)y]n (where R is a lower alkyl group having from 1 to about 6 carbon atoms, a lower alkenyl group having from 2 to about 6 carbon atoms, or a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, and n is greater than 1), a polycarbosilane having repeat units of the formula [RaSi(H)-(CH2)q] (where Ra is H, a lower alkyl group having from 1 to about 6 carbon atoms, a cycloalkyl group having from 3 to about 6 carbon atoms, or a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, q is an integer 1 or greater), and a polysiloxane having repeat units of the formula [RbSi(H)O]n (where Rb is a lower alkyl group having from 1 to about 6 carbon atoms, a cycloalkyl group having from 3 to about 6 carbon atoms, or a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, and n is an integer greater than 1). Novel preceramic polymers formed by this method are also disclosed.
545027
Schwark Joanne M.
Seyferth Dietmar
Yu Yuan-Fu
Massachusetts Institute Of Technology
Ridout & Maybee Llp
LandOfFree
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