Thermal oxidation crosslinking in the blended precursors of organosilicon polymers containing polyvinylsilane with polycarbosilane

The polymer precursors containing polyvinylsilane (PVS) with polycarbosilan e (PCS) in coating form were prepared. As the content of PVS increases, the onset temperature of the precursor oxidation decreases and the surfaces fo rmed after the oxidation become smooth and hard. The role of SI-H bonds in the PCS-PVS systems during the oxidation is quantitatively analysed on the basis of the absorption of the SI-H stretching band in the precursor spectr a. In the blended systems, the oxidation of the Si-H groups forms the dense crosslinked polymer layer which limits the oxygen diffusion into the precu rsor interior. (C) 1998 Chapman & Hall.