Abstract
A linear, ethoxy-substituted polycarbosilane has been prepared by ring-opening polymerization of 1,1,3,3-tetraethoxy-1,3-disilacyclobutane. After hydrolysis, condensation and drying, the obtained gel was pyrolyzed under nitrogen to give a silicon oxycarbide glass. The gel and its pyrolysis chemistry were characterized by elemental analysis, thermogravimetric analysis, 29Si and 13C MAS NMR, FTIR and mass spectrometric analysis of the gaseous pyrolysis products. The conversion of the [SiOCH2]n network, which has a nearly pure SiC2O2 micro environment at the outset, into a silicon oxycarbide that contains a full distribution of the five possible SiC4−xOx environments occurs between 600 and 1000°C. This suggests the occurrence of redistribution reactions involving the exchange of Si-O and Si-C bonds during the pyrolysis.
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