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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.1K

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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在较高固体含量下超快速热RAFT去聚合.

Dimitra Mantzara1, Richard Whitfield1, Hyun Suk Wang1

  • 1Laboratory of Polymeric Materials, Department of Materials, ETH Zurich, Zurich, 8093, Switzerland.

ACS macro letters
|February 10, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种激素启动器,以加速热可逆失活激素聚合 (RAFT) 脱聚合. 这一创新使得聚合物在更缩的条件下和各种溶剂中能够更快地回收.

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科学领域:

  • 聚合物化学 聚合物化学
  • 化学回收利用 化学回收利用 化学回收利用
  • 可持续材料 可持续材料

背景情况:

  • 热可逆失活激素聚合 (RAFT) 脱聚化是一种新兴的化学回收方法.
  • 目前的RAFT脱聚合方法受到专用溶剂,长反应时间和稀释条件的限制.

研究的目的:

  • 为了克服现有的热RAFT脱聚合技术的局限性.
  • 提高聚合物化学回收的效率和适用性.

主要方法:

  • 引入商用激素启动器以动力解锁脱聚合.
  • 优化启动器度用于速度加速.
  • 测试不同溶剂和更高度的脱聚合率.

主要成果:

  • 通过优化启动剂度,实现了72倍的速度加速,在5分钟内完成了脱聚合.
  • 保持高脱聚合率,重复单位度增加20倍.
  • 在多种溶剂中如DMSO,anisole和toluene中证明了成功的单体回收.

结论:

  • 激进启动器显著提高了热RAFT脱聚合率和效率.
  • 这种优化的方法扩大了RAFT脱聚合的范围,用于实际的聚合物回收.
  • 这些发现提供了机械洞察力,并扩大了可持续聚合物化学的应用.