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相关概念视频

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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微波辅助的聚合甲酸的脱聚合.

Manish Kumar1, Maxime Michelas1, Cyrille Boyer1

  • 1School of Chemical Engineering, UNSW Sydney, Sydney, New South Wales 2052, Australia.

ACS macro letters
|June 20, 2025
PubMed
概括
此摘要是机器生成的。

本研究提出了一种绿色,无催化剂的微波辅助方法来回收聚合甲基酸盐. 该过程有效地利用甲醇从各种聚合物中回收单体,支持循环经济目标.

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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科学领域:

  • 聚合物化学 聚合物化学
  • 绿色化学 绿色化学
  • 可持续材料 可持续材料

背景情况:

  • 聚合物废弃物是一个重大的环境挑战.
  • 有效和环保的回收利用方法对于可持续性至关重要.
  • 目前的回收方法通常涉及恶劣的条件或催化剂.

研究的目的:

  • 开发一种无催化剂的微波辅助脱聚合方法,用于RAFT终结的聚合甲基酸盐.
  • 使用甲醇作为双功能的辅溶剂,以增强微波吸收和良性反应介质.
  • 展示一个可扩展和经济可行的聚合物回收解决方案.

主要方法:

  • 微波辅助的RAFT终结聚合甲酸的脱聚合.
  • 使用甲醇作为辅溶剂和反应介质.
  • 研究中的聚甲基酸盐 (PMMA),聚二乙基酸盐 (PHEMA) 和聚甲基酸盐 (PBzMA).
  • 对于PMMA,有不同的分子量和RAFT末端组.

主要成果:

  • 实现了各种聚合甲酸盐的高效脱聚合和单体回收.
  • 证明了强烈的温度依赖性,在110-140°C之间具有最佳的单体回收.
  • 在高重复单位度 (高达200毫米) 和120°C等温度下显示有效性.
  • 成功地去聚合了PMMA,PHEMA和PBzMA.

结论:

  • 无催化剂的微波辅助脱聚合是一种快速有效的回收策略.
  • 这种方法提供了一种绿色,可扩展和经济可行的方法来缓解聚合物废物.
  • 该过程与可持续的聚合物管理的循环经济原则保持一致.