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环氧乙烷于双金属氧联醇盐或i-Bu_3Al-H_3PO_4-H_2O-二甲基苯胺(DMA)四元催化剂作用下在甲苯中呈均相聚合。二种催化剂均显示出高度活性,但前一体系的聚合速度较后一体系平缓。产物分子量可高达一百万。如用石油醇醚为溶剂,则转化率及分子量均下降。四元催化剂的最佳组成比为i-Bu_3Al:H_3PO_4:H_2O:DMA=1:0.17:0.17:0.10。产物溶于水并能模压成型。扯断强度随分子量增加而增加,可达100公斤/厘米~2。
Ethylene oxide is homogeneously polymerized in toluene in the presence of bimetallic oxyalkoxide or i-Bu_3Al-H_3PO_4-H_2O-dimethylaniline (DMA) quaternary catalyst. Both catalysts showed high activity, but the polymerization rate of the former system was slower than the latter. Product molecular weight up to one million. Such as the use of petroleum ether as a solvent, the conversion rate and molecular weight decreased. The optimum composition ratio of the quaternary catalyst is i-Bu_3Al: H_3PO_4: H_2O: DMA = 1: 0.17: 0.17: 0.10. The product is soluble in water and can be molded. Breaking strength increases with increasing molecular weight, up to 100 kg / cm ~ 2.