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Chemical modification of commercially available polyorganosilazane (HTT1800) and polyorganosiloxane (Polyramic RD-684a) with divinylbenzene (DVB) is accomplished via hydrosilylation reaction. The incorporation of DVB leads to an increase of the free carbon amount after pyrolysis within the corresponding SiCN and SiOC ceramics. The modification is carried out with lower, equal and higher stoichiometric ratios of the Sisingle bondH to Cdouble bondC groups present in the Si-based polymer and DVB. FTIR results indicate a complete consumption of the Sisingle bondH bonds in the case of the stoichiometric amount of DVB and polymer RD-684a, while for HTT1800 neither the stoichiometric ratio nor DVB excess leads to a complete consumption of the Sisingle bondH groups. For both SiCN and SiOC ceramics the carbon content is found to increase with the amount of DVB. However, the most significant …