Periodic Mesoporous SiCO Glasses with Cubic Symmetry Stable at 1000 deg C

摘要

Aperiodic mesoporous organosilica (PMO) with cubic Pm3n structure has been prepared from bis(trimethoxysilyl)ethane and cetytriethylammonium chloride.The sample has been heat treated under argon up to 1000 deg C,and the pyrolysis intermediates were analysed by X-ray diffraction using synchrotron radiation,multinuclear solid state NMR ~(29)Si,~3C and ~1H) and N_2 adsorption-desorption experiments.The cubic Pm3n structure is retained after pyrolysis at 1000°C.The sample is a SiCO glass with mixed SiC_xO_(4-x) units (x = 0,1,2) and a very large surface area of 730 m~2/g.