Abstract
Polycarbosilane (PCS) synthesized at high temperature under high pressure from liquid polysilane was shown to be an organosilicon polymer with a Si–C backbone. MW of the PCS with a softening point of 209°C was about 2861. Elemental analysis gave an empirical formula of SiC1.86H7.50O0.02. IR and 29Si-NMR showed the presence of SiC4 and SiC3H structural units. The H mole ratio for C–H bond to Si–H bond was about 9.83, and the Si mole ratio for SiC3H to SiC4was about 0.94. TG analysis showed the ceramic yield of the PCS at 1200°C in N2 to be about 78.9%. β-SiC microcrystal was obtained when the PCS was pyrolyzed at 1250°C in N2 with a grain size of about 35.9 Å.
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