S. Okuzaki et al., Synthesis and properties of chemically modified polycarbosilane containingorganofluoric groups, J MATER RES, 14(4), 1999, pp. 1353-1358
The chemically modified polycarbosilane (PC) containing organofluoric group
s, PCOCF, was synthesized through chemical reaction of PC and fluoric alcoh
ol. Pyrolysis of the polymer precursor occurred in three stages under 1000
degrees C, Weight loss due to evaporation of low molecular compounds was ob
served at the first stage below 300 degrees C, followed by the largest weig
ht loss from 300 to 600 degrees C at the second stage. At this stage, side
chains formed during the chemical reaction were removed. Finally, side chai
ns such as Si-CH3 decomposed at the third stage above 600 degrees C, At 100
0 degrees C, the chemical modification of PC resulted in high yield of soli
d product. After coating PCOCF on silicon carbide (SiC) powders, the conver
sion yield of pyrolyzed PCOCF was further improved due to the interaction b
etween PCOCF and SiC powders. Coating of PCOCF on SiC powders was found to
be effective in increasing the green density of uniaxially pressed bodies.