【摘要】 最近我们研究发现环氧乙烷（ＥＯ）可有效地促进低腐蚀性磷钨杂多酸（ＰＷ１２）引发的四氢呋喃（ＴＨＦ）聚合反应，产物分子量可通过体系中水或低分子二醇的含量进行控制［１，２］．而在没有ＥＯ存在时，相似条件下ＰＷ１２引发ＴＨＦ聚合反应２４ｈ，没有检出聚合物［...更多还原

【Abstract】 Reaction behavior of ethylene oxide in the polymerization of tetrahydrofuran initiated by H3PW12O40 was studied. The polymerization started upon addition of ethylene oxide, and stopped with complete consumption of ethylene oxide, but started again when a new portion of EO was added, and also stopped after the new portion of EO was exhausted again. Part of ethylene oxide was transformed into dioxane at the fairly beginning of polymerization in the presence or absence of water, but the formation of dioxane could be suppressed by the addition of ethylene glycol. Kinetic data showed that the concentration of propagating species maintained constant during the polymerization with stepwise addition of EO. A reaction mechanism was postulated based on the structure analysis of the product and kinetics study. \=更多还原