• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Photoinduced living cationic polymerization of tetrahydrofuran. I. Living nature of the system and its application to the diblock copolymer synthesis
【24h】

Photoinduced living cationic polymerization of tetrahydrofuran. I. Living nature of the system and its application to the diblock copolymer synthesis

机译：四氢呋喃的光诱导活性阳离子聚合。一，该体系的活性及其在二嵌段共聚物合成中的应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The living nature of cationic polytetrahydrofuran (THF), photoinduced in the presence of diphenyliodonium hexafluorophosphate (initiator), was investigated. In the bulk polymerization of THF, the linear relationship between percent conversion and the number-average molecular weight of the resulting polymer strongly suggests the living nature of this polymer and this was confirmed by the monomer addition technique, that is, cationic poly(THF) is capable of initiating a newly added monomer. The loss of the living nature of the cationic poly(THF) in a polar solvent, dichloromethane, is explained in terms of the stabilization of the five-membered cyclic oxonium ion, a propagating species of cationic polymerization of THF, by ion-pair formation with a less nucleophilic counterion, hexafluorophosphate. Based on the living nature of cationic poly(THF), a diblock copolymer, composed of THF and N-2-(hydroxyethyl) ethyleneimine (HEEI) was synthesized by subsequent monomer addition method; however, it was found that the HEEI block of the compolymer has a nonlinear structure. The factors affecting the structure of the HEEI block are also discussed. (C) 1998 John Wiley & Sons, Inc. [References: 22]
机译：研究了在六氟磷酸二苯基碘鎓（引发剂）存在下光诱导的阳离子聚四氢呋喃（THF）的活性。在THF的本体聚合中，转化百分率与所得聚合物的数均分子量之间的线性关系强烈表明该聚合物的活性，这通过单体加成技术即阳离子聚（THF）得到证实。能够引发新加入的单体。阳离子聚（THF）在极性溶剂（二氯甲烷）中的活泼性丧失是通过五元环氧鎓离子（THF阳离子聚合的传播物种）通过离子对形成的稳定化来解释的亲核抗衡离子较少的六氟磷酸酯根据阳离子聚四氢呋喃的活性，通过随后的单体加成方法合成了由四氢呋喃和N-2-（羟乙基）亚乙基亚胺（HEEI）组成的二嵌段共聚物。然而，发现该共聚物的HEEI嵌段具有非线性结构。还讨论了影响HEEI块结构的因素。 （C）1998 John Wiley＆Sons，Inc. [参考：22]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号