A new technical approach to the synthesis of novel silicon containing polyurethane by the non carbothermal method directly from SiO 2 was studied.Firstly a high reactive pentacoordinate organic silicon complex[(KSi(OC...A new technical approach to the synthesis of novel silicon containing polyurethane by the non carbothermal method directly from SiO 2 was studied.Firstly a high reactive pentacoordinate organic silicon complex[(KSi(OCH 2CH 2O) 2(OCH 2CH 2OH)]was prepared,by means of the reaction of a high surface area silica with ethylene glycol and potassium hydroxide.Then a novel tetracoordinate silicon (OCH 2CH 2O)Si(OCH 2CH 2OH)(OCH 2CH 2OCH 2CH 2OH)was synthesized by the reaction of ClCH 2CH 2OH 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 T g was 115 09℃,GPC analysis showed that the molecular weight of silicon containing polyurethane is between several ten thousand and a hundred thousand.展开更多
文摘A new technical approach to the synthesis of novel silicon containing polyurethane by the non carbothermal method directly from SiO 2 was studied.Firstly a high reactive pentacoordinate organic silicon complex[(KSi(OCH 2CH 2O) 2(OCH 2CH 2OH)]was prepared,by means of the reaction of a high surface area silica with ethylene glycol and potassium hydroxide.Then a novel tetracoordinate silicon (OCH 2CH 2O)Si(OCH 2CH 2OH)(OCH 2CH 2OCH 2CH 2OH)was synthesized by the reaction of ClCH 2CH 2OH 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 T g was 115 09℃,GPC analysis showed that the molecular weight of silicon containing polyurethane is between several ten thousand and a hundred thousand.
