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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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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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相关实验视频

Updated: Jun 21, 2025

Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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机械化学促进后消费聚甲基酸和聚甲基的功能化,用于批量去聚合.

James B Young1, Sofia L Goodrich1, James A Lovely1

  • 1George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science and Engineering, Department of Chemistry, University of Florida, 32611, Gainesville, FL, United States.

Angewandte Chemie (International ed. in English)
|July 15, 2024
PubMed
概括

这项研究引入了一种新的机械化学方法,用于高效的聚合物脱聚合. 该技术使用超声波将PMMA和PAMS等塑料分解为可重复使用的单体,解决持久塑料废物.

关键词:
化学回收利用 化学回收利用 化学回收利用脱聚合脱聚合方式机械化学 机械化学

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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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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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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
  • 材料科学 材料科学 材料科学
  • 可持续化学 可持续化学

背景情况:

  • 传统的脱聚合方法与超高分子量 (UHMW) 聚合物相斗争.
  • 持久性,不可降解的塑料对环境构成重大挑战.
  • 有效回收塑料,如聚甲基酸 (PMMA) 和聚甲基 (PAMS) 是至关重要的.

研究的目的:

  • 开发一种后聚合功能化方法,以实现高效的批量去聚合.
  • 为了使高纯度的单体从固的聚合物中回收.
  • 为塑料废物建立一个可扩展和高效的脱聚合战略.

主要方法:

  • 使用超声波诱导的链切用于机械化学的宏观根基生成.
  • 在聚合物链末端的功能化中使用N-基胺甲酸盐 (PhthMA).
  • 将功能化策略应用于PMMA和PAMS用于散装脱聚合.

主要成果:

  • 在30分钟内实现PMMA和PAMS高达82%的脱聚合.
  • 回收的高纯度单体适合再聚合.
  • 通过超高分子量 (UHMW) 聚合物证明了高效率.
  • 从消费后废物中成功解聚商业电池造PMMA.

结论:

  • 由PhthMA促进的机械化学脱聚合对PMMA和PAMS有效.
  • 这种方法为回收持久塑料材料提供了一个有希望的解决方案.
  • 这种方法对高压聚合物有效,并且适用于消费后塑料废物.