Scholarlink

<p>Monomer design strategy has become a powerful tool to access chemically recyclable polymers with desired and diverse properties. The presence of two or multiple stereogenic centres in one monomer offers a new dimension to fine-tune the polymer performance. However, it is still a formidable challenge in synthetic polymer chemistry to achieve precise stereocontrol and sequence control over the polymer microstructure. Here we report a stereo- and sequence-controlled polymerization of 5<i>H</i>-1,4-benzodioxepin-3(2<i>H</i>)-one-based monomers with two stereogenic centres (<b>M</b>) to furnish a series of isoenriched AB diblock polymers P(<i>cis</i>-<b>M</b>)-<i>b</i>-P(<i>trans</i>-<b>M</b>) and ABA triblock polymers P(<i>trans</i>-<b>M</b>)-<i>b</i>-P(<i>cis</i>-<b>M</b>)-<i>b</i>-P(<i>trans</i>-<b>M</b>). Notably, P(<i>cis</i>-<b>M2</b>)<sub>900</sub>-<i>b</i>-P(<i>trans</i>-<b>M2</b>)<sub>38</sub> delivered impressive toughness and ductility, comparable to the commodity plastic isotactic polypropylene; the ABA triblock P(<i>trans</i>-<b>M2</b>)<sub>26</sub>-<i>b</i>-P(<i>cis</i>-<b>M2</b>)<sub>900</sub>-<i>b</i>-P(<i>trans</i>-<b>M2</b>)<sub>26</sub> appeared to be softer and resembled low-density polyethylene. These various materials could fully convert to the monomer <b>M</b>. The establishment of stereo- and sequence-controlled polymerization not only provides an effective and robust strategy to tailor polymer properties on the molecular level, but also delivers various chemically recyclable materials that can be converted back to monomers.</p><p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

High-performance recyclable polymers enabled by stereo- and sequence-controlled polymerization

  • 期刊论文

  • 发表日期：

    2025年5月16日

查看全文
  • Meng-Yuan Wang,
  • Yi-Min Tu,
  • Qing-Qian Zeng,
  • Kun Li,
  • Wei Xiong,
  • Zhongzheng Cai,
  • Jian-Bo Zhu

摘要

Monomer design strategy has become a powerful tool to access chemically recyclable polymers with desired and diverse properties. The presence of two or multiple stereogenic centres in one monomer offers a new dimension to fine-tune the polymer performance. However, it is still a formidable challenge in synthetic polymer chemistry to achieve precise stereocontrol and sequence control over the polymer microstructure. Here we report a stereo- and sequence-controlled polymerization of 5H-1,4-benzodioxepin-3(2H)-one-based monomers with two stereogenic centres (M) to furnish a series of isoenriched AB diblock polymers P(cis-M)-b-P(trans-M) and ABA triblock polymers P(trans-M)-b-P(cis-M)-b-P(trans-M). Notably, P(cis-M2)900-b-P(trans-M2)38 delivered impressive toughness and ductility, comparable to the commodity plastic isotactic polypropylene; the ABA triblock P(trans-M2)26-b-P(cis-M2)900-b-P(trans-M2)26 appeared to be softer and resembled low-density polyethylene. These various materials could fully convert to the monomer M. The establishment of stereo- and sequence-controlled polymerization not only provides an effective and robust strategy to tailor polymer properties on the molecular level, but also delivers various chemically recyclable materials that can be converted back to monomers.