杂多酸引发四氢呋喃聚合反应 Ⅱ.水的反应行为  

THTRAHYDROFURAN POLYMERIZATION INITIATED WITH HETEROPOLYACID Ⅱ.REACTION BEHAVIOR OF WATER

作　　者：张阿方[1] 张广利[1] 张鸿志[1] 

机构地区：[1]北京大学化学与分子工程学院

出　　处：《高分子学报》1999年第2期244-247,共4页Acta Polymerica Sinica

基　　金：高等学校博士学科点专项科研基金

摘　　要：前报我们对低腐蚀性非均相的磷钨杂多酸Ｈ３ＰＷ１２Ｏ４０（ＰＷ１２）引发体系进行了研究［１］，发现环氧乙烷（ＥＯ）可有效地促进ＰＷ１２引发的四氢呋喃（ＴＨＦ）聚合反应，大幅度地降低了引发剂用量，聚合物收率显著提高，并发现聚合过程中不存在链终止反应．产物...The reaction behavior of water in tetrahydrofuran polymerization initiated by a heteropolyacid,H 3PW 12 O 40 in the presence of ethylene oxide was studied.The variation of components during polymerization was monitored by gas chromatography.Most of water was converted in the earlier stage of the polymerization into ethylene glycol,which was consumed in the subsequent reaction process through chain transfer reaction.Water could not take part in the initiation reaction to start a polymer chain and might reduce the activity of the polymerization.Low molecular weight glycol such as ethylene or butylene glycol has a similar effect with water on controlling the molecular weight of the polymer.The molecular weight of the product can be predicted by an equation based upon concentrations of molecular weight controller and heteropolyacid,and conversion of polymerization.

关 键 词：聚四氢呋喃 杂多酸 阳离子聚合 分子量调节剂 水 

分 类 号：O633.5[理学—高分子化学]