支化结构二氧化碳基六元醇的可控合成

发布时间：2018-05-10 20:31

  本文选题：二氧化碳 + 环氧丙烷　； 参考：《高分子学报》2017年02期

【摘要】：利用Zn-Co双金属氰化物为催化剂,疏水性二季戊四醇(DPE)作为起始剂,实现了二氧化碳(CO_2)和环氧丙烷(PO)的不死共聚合,高效、高选择性地合成了支化结构CO_2基六元醇,且该产物有6个羟基封端.该支化CO_2基六元醇的合成路线具有可控的特点,其分子量可通过PO与DPE的摩尔比准确控制(1500~8000),同时分子量分布很窄(最低至1.08).值得注意的是,降低反应温度可显著改善聚合选择性,例如,当温度为50℃时,产物碳酸酯单元含量高达60%,而反应副产物环状碳酸酯的含量可控制在5.5 wt%以下,但是体系催化活性下降至0.14 kg g-1.该支化结构CO_2基六元醇有望作为高交联密度的多元醇,用于制备高强硬质聚氨酯泡沫材料.
[Abstract]:Using Zn-Co bimetallic cyanide as catalyst and hydrophobic dipentaerythritol (DPE) as initiator, the undead copolymerization of CO _ 2 and PO _ (2) was carried out. The branched CO_2 unit hexadecyl alcohol was synthesized efficiently and highly selectively. There are 6 hydroxyl groups in the product. The synthetic route of the branched CO_2 hexadecyl alcohol is controllable. Its molecular weight can be accurately controlled by the molar ratio of PO to DPE, and the molecular weight distribution is very narrow (the lowest is to 1.08C). It is worth noting that the polymerization selectivity can be significantly improved by lowering the reaction temperature. For example, when the reaction temperature is 50 鈩，

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