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首页> 外文期刊>Macromolecules >Synthesis of Highly Defined Graft Copolymers Using a Cyclic Acetal Moiety as a Two-Stage Latent Initiating Site for Successive Living Cationic Polymerization and Ring-Opening Anionic Polymerization
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Synthesis of Highly Defined Graft Copolymers Using a Cyclic Acetal Moiety as a Two-Stage Latent Initiating Site for Successive Living Cationic Polymerization and Ring-Opening Anionic Polymerization

机译：使用循环缩醛部分合成高度限定的接枝共聚物作为连续活阳离子聚合和开环阴离子聚合的两级潜入式启动部位

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摘要

The synthesis of well-defined graft copolymers with designed intervals between branches was achieved using cyclic acetal moieties as two-stage latent initiating sites. A cyclic acetal was shown to initiate the living cationic polymerization of vinyl ethers (VEs), yielding a polymer with a hydroxy group at the α-end derived from the cyclic acetal. The newly generated hydroxy group was able to efficiently induce the subsequent ring-opening anionic polymerization of l-lactide (LLA), and a diblock copolymer with a narrow molecular weight distribution (MWD) was obtained. For the synthesis of a graft copolymer, a five-membered cyclic acetal moiety was introduced at the ω-chain ends of poly(VE)s, which was employed as the initiating site for the living cationic polymerization of VEs. Repeated polymerization and acetalization generated a macroinitiator with several hydroxy groups on the side chain of a poly(VE) backbone. Graft copolymers possessing branches with narrow MWDs and regular spaces between the branches were synthesized by the ring-opening polymerization of LLA using this macroinitiator.
机译：使用环状缩醛部分作为两阶段潜在的引发位点实现具有在分支之间的设计间隔的近义接枝共聚物的合成。显示循环缩醛，引发乙烯基醚（Ves）的活阳离子聚合，从源自环缩醛的α-末端产生羟基的聚合物。新产生的羟基能够有效地诱导随后的L-丙交酯（LLA）的开环阴离子聚合，并获得具有窄分子量分布（MWD）的二嵌段共聚物。对于接枝共聚物的合成，在聚（VE）S的ω-链末端引入五元环缩醛部分，其用作活性阳离子聚合的引发位点。反复聚合和缩醛化产生具有几种羟基的大磷酸酯，在聚（Ve）骨架的侧链上。通过使用该显微引发剂的开环聚合，合成具有具有窄MWDS的分支和分支之间的规则空间的接枝共聚物。

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  • 来源
    《Macromolecules》 |2018年第3期|共11页
  • 作者

    Norifumi Yokoyama; Arihiro Kanazawa; Shokyoku Kanaoka; Sadahito Aoshima;

  • 作者单位

    Department of Macromolecular Science Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan;

    Department of Macromolecular Science Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan;

    Department of Macromolecular Science Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan;

    Department of Macromolecular Science Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高分子化学（高聚物）;
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