TETRAHYDROFURAN POLYMERIZATION INITIATED BY HETEROPOLYACID Ⅶ. OXETANE AS PROMOTER

在以低浓度杂多酸(HPA)催化四氢呋喃(THF)聚合反应中,我们曾采用环氧乙烷(EO)、环氧丙烷(PO)和环氧氯丙烷(ECH)等三元环醚为促进剂,发现它们对聚合反应都具有很好的促进效果[1～3]. 本文进一步研究了具有四元环醚结构的氧杂环丁烷(OX)对THF聚合的促进效果.The polymerzation of tetrahydrofuran (THF) initiated by heteropolyacid-H3PW12 O-40 in low concentration could be promoted by oxetane (OX), but the polymerization stopped at lower conversion than that promoted by oxiranes. The chain structure analysis by NMR spectra showed that OX was more reactive toward polymerization than oxiranes and more than 80% of OX were consumed through copolymerization, but not initiation. By stepwise addition of OX the conversion of THF polymerization could be increased higher than 50%. The percentage of the hydroxyl group attached to OX moieties at the polymer chain-ends was higher than 50% of the total hydroxyl end-groups, inferring that polymerization proceeded quite similar to that promoted by ethylene oxide and Each chain was started with the OX moiety.广东省博士启动基金http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000089003100026&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)24506-50