Surface changes during pyrolytic conversion of hybrid materials to oxycarbide glasses

摘要: Hybrid materials from TEOS–TBOT–PDMS have been prepared and pyrolyzed between 400 1,000 °C. The surface characteristics of this type studied by nitrogen adsorption, mercury intrusion porosimetry, inverse gas chromatography at infinite dilution (IGC). IGC has used for obtaining the dispersive acid–base energies different materials. specific areas pore volumes samples resulted to increase pyrolysis temperatures ranging 600 °C decrease higher temperatures. On other hand, when are 800 °C then after When material is highest temperature, close that typical glasses. It observed pyrolyzing values both components free energy (dispersive specific). energy–pyrolysis temperature variation does not correspond formation micropores in during process. Therefore, it assumed high active sites must be formed on 800 °C.