A new technical approach to the synthesis of novel silicon-containing polyurethane by the noncarbothermal method directly from SiO2 was studied．Firstly a high reactive pentacoordinate organic silicon complex [(KSi(OCH2CH2O)2(OCH2CH2OH)] was prepared

by means of the reaction of a high surface area silica with ethylene glycol and petassium hydroxide．Then a novel tetracoordinate silicon(OCH2)CH2O)Si(OCH2CH2OH)(OCH2CH2OCH2CH2OH) was synthesized by the reaction of lCH2CH2OH with reactive pentacoordinate silicon complex．Lastly a novel silicon-containing polyurethane was synthesized by low-temperature solution condensation between tetracoordinate silicon and 2

4-toluene diisocyanate in dimethyl sulfoxide．The product was characterized and analyzed by FTIR

TG

DSC

GPC etc．The IR spectra exhibited a characteristic strong absorption band for ester carbonyl at 1724.05cm-1. TG analysis showed a better thermal stability．DSC curves declared that its Tg was 115.09℃

GPC analysis showed that the molecular weight of silicon-containing polyurethane is between several ten thousand and a hundred thousand．