配位有机硅在聚醚氨酯中的应用

研究了直接从无定型二氧化硅出发，与乙二醇、氢氧化钾反应，生成高反应活性的五配位硅钾络合物，并以此为原料与2－氯乙醇反应制备双羟基四配位有机硅单体，该单体作为扩连剂再与异氰酸酯基封端的聚醚或聚酯进行低温溶液缩聚反应合成含硅聚醚氨酯，经红外光谱，热重分析，胶渗透色法测定分子量等对合成的物质作了结构表征，热重分析表明该聚合物的耐热性能有所提高，胶渗透色谱法测定分子量高于10万。

The Synthesis of Silicon-containing Polyether Urethane

A new technical approach to the synthesis of novel silicon containing polyether urethane by the non carbothermal method directly from SiO 2 had been studied. Firstly a high reactive pentacoordinate organic silicon complex had been 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) had been synthesized by the reaction of ClCH 2CH 2OH with the reactive pentacoordinate silicon complex. Lastly a novel silicon containing polyether urethane was synthesized by low temperature solution condensation between the tetracoordinate silicon and poly(ether diisocyanate) in dimethyl sulfoxide. The product had been characterized and analyzed by FTIR, TG, GPC etc. The IR spectra of polyester exhibited a characteristic strong absorption band for ester carbonyl in the 1724.0cm -1 . TG analysis showed the better thermal stability. GPC analysis showed that the molecular weight of the silicon containing polyester is between several ten thousand.