...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Macromolecular rapid communications: Publishing the newsletters of the European Polymer Federation >Investigation of Tacticity and Living Characteristics of Photoredox-Mediated Metal-Free Ring-Opening Metathesis Polymerization
【24h】

Investigation of Tacticity and Living Characteristics of Photoredox-Mediated Metal-Free Ring-Opening Metathesis Polymerization

机译：照相介导的无金属开环复分解聚合的术文和生活特性研究

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

This study investigated the microstructures of polymers produced via photoredox-mediated metal-free ring-opening metathesis polymerization. Polynorbornene, poly(exo-dihydrodicyclopentadiene), and poly(endo-dicyclopentadiene) were found to have cis olefin contents of 23%, 24%, and 28%, respectively. Additionally, the cis/trans ratio remained consistent during the course of norbornene polymerization. Polymer tacticity was evaluated by quantitative C-13 NMR spectroscopy, which revealed each polymer to be largely atactic. Specifically, the three polymers were estimated to be 33%, 58%, and 55% syndiotactic, respectively. In parallel, this study also explored the ability to produce diblock copolymers from norbornene and exo-dihydrodicyclopentadiene. Successful diblock copolymerization was achieved using either monomer order. In each case, however, the results suggested to us that chain-chain coupling (increased molecular weight) and irreversible termination (dead chains observed during attempted chain extension) occurred when reaction times were extended.
机译：该研究研究了通过光毒氧介导的无金属开环复分解聚合产生的聚合物的微观结构。发现多冰片烯，聚（外脱二氯化二环酮）和聚（内荷 - 二环戊二烯）分别具有23％，24％和28％的顺式烯烃含量。另外，在降冰片烯聚合过程中，顺式/反式比保持一致。通过定量的C-13 NMR光谱评价聚合物转发性，其揭示了每种聚合物在很大程度上是attactiC的。具体地，估计三种聚合物分别为33％，58％和55％的间同立构。同时，该研究还探讨了从降冰片烯和外脱二氢转络二烯生产二嵌段共聚物的能力。使用单体序列实现成功的二嵌段共聚。然而，在每种情况下，当反应时间延长时，向我们提出的链条链偶联（增加分子量）和不可逆终止（观察到的止血链期间观察到的死链）。

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