...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Macromolecules >Synthesis of block copolymers of ethylene with styrene and n-butyl acrylate via a tandem strategy combining ethylene 'Living' polymerization catalyzed by a functionalized Pd-diimine catalyst with atom transfer radical polymerization
【24h】

Synthesis of block copolymers of ethylene with styrene and n-butyl acrylate via a tandem strategy combining ethylene 'Living' polymerization catalyzed by a functionalized Pd-diimine catalyst with atom transfer radical polymerization

机译：通过串联策略合成乙烯与苯乙烯和丙烯酸正丁酯的嵌段共聚物，该策略将官能化的Pd-二亚胺催化剂催化的乙烯“活”聚合与原子转移自由基聚合相结合

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

We report a new two-step tandem strategy combining two versatile "living" polymerization techniques, Pd-diimine catalyzed ethylene "living" polymerization and atom transfer radical polymerization (ATRP), for the synthesis of functionalized polyethylene (PE) diblock copolymers containing an ethylene block and a functional monomer block, such as styrene and n-butyl acrylate. The key to the success of this tandem strategy is the development of a novel functionalized Pd-diimine catalyst, [(ArN = C(Me)-(Me)C = NAr)Pd-(CH2)(3)C(O)O(CH2)(2)OC(O)C(CH3)(2)Br]+SbF6- (Ar = 2,6-(iPr)(2)C6H3) (3), which uniquely contains a 2-bro-moisobutyryl substituting group on its chelate structure. This catalyst was synthesized by convenient equimolar reaction of the acetonitrile Pd-diimine adduct, [(ArN = C(Me)-(Me)C = NAr)Pd(CH3)(N CMe)]+SbF6- (Ar = 2,6-(iPr)(2)C6H3) (1), with a functional acrylate monomer, 2-(2-bromoisobutyryloxy) ethyl acrylate (BIEA). The remarkable feature of 3 lies in its unprecedented ability to catalyze ethylene "living" polymerization that directly gives rise to telechelic PE chains bearing an end-capping 2-bromoisobutyryl group active for initiating ATRP. The resulting end-functionalized PEs can thus be directly used as macroinitiators to subsequently initiate ATRP of functional monomers, like styrene and n-butyl acrylate used in this work, in the second step of this tandem strategy to synthesize functionalized diblock copolymers. Because of the "living" polymerization nature of both steps in this tandem strategy, we demonstrate that the functionalized block copolymers synthesized possess well-defined structures with narrow molecular weight distributions and controllable lengths for both PE and functional monomer blocks.
机译：我们报告了一种新的两步串联策略，该策略结合了两种通用的“活性”聚合技术，Pd-二亚胺催化的乙烯“活性”聚合和原子转移自由基聚合（ATRP），用于合成含乙烯的功能化聚乙烯（PE）二嵌段共聚物嵌段和功能性单体嵌段，例如苯乙烯和丙烯酸正丁酯。此串联策略成功的关键是开发新型的功能化Pd-二亚胺催化剂，[（ArN = C（Me）-（Me）C = NAr）Pd-（CH2）（3）C（O）O （CH2）（2）OC（O）C（CH3）（2）Br] + SbF6-（Ar = 2,6-（iPr）（2）C6H3）（3），其中唯一包含2-溴-异丁酰基在其螯合物结构上取代基。该催化剂是通过乙腈Pd-二亚胺加合物[[（ArN = C（Me）-（Me）C = NAr）Pd（CH3）（N CMe）] + SbF6-（Ar = 2,6）的便捷等摩尔反应合成的-（iPr）（2）C6H3）（1），具有官能丙烯酸酯单体，丙烯酸2-（2-溴异丁酰氧基）乙酯（BIEA）。 3的显着特征在于其空前的催化乙烯“活性”聚合的能力，该能力直接产生带有末端封端的2-溴异丁酰基基团以引发ATRP的远螯PE链。因此，在该串联策略的第二步中，可以将所得的末端官能化的PE直接用作大分子引发剂，以随后引发本单体中使用的功能单体（如苯乙烯和丙烯酸正丁酯）的ATRP，从而合成官能化的二嵌段共聚物。由于在此串联策略中两个步骤的“活性”聚合性质，我们证明合成的官能化嵌段共聚物具有良好定义的结构，该结构具有窄的分子量分布和PE和功能性单体嵌段的可控制长度。

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