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相关概念视频

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.5K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
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...
2.0K

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相关实验视频

Updated: Jun 12, 2025

Solvent Bonding for Fabrication of PMMA and COP Microfluidic Devices
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Solvent Bonding for Fabrication of PMMA and COP Microfluidic Devices

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用热触发器进行PMMA的改装,以实现高效的脱聚合

Rhys W Hughes1, Tanmoy Maity1, Timothée Sergent1

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

Journal of the American Chemical Society
|June 3, 2025
PubMed
概括
此摘要是机器生成的。

本研究提出了一种使用热敏触发器有效脱聚甲酸 (PMMA) 的新方法. 这种方法为回收PMMA废物提供了可持续的解决方案.

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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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相关实验视频

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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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科学领域:

  • 聚合物化学
  • 可持续材料科学
  • 化学工程

背景情况:

  • 聚甲酸 (PMMA) 是一种广泛使用的塑料,产生大量的废物.
  • 目前的PMMA回收方法往往耗费大量能源或效率低下.
  • 开发闭环脱聚合方法对于可持续的聚合物经济至关重要.

研究的目的:

  • 为PMMA开发一种高效的闭环散装脱聚合方法.
  • 采用热敏触发器进行低温脱聚变.
  • 证明该方法适用于商业PMMA和聚合物网络.

主要方法:

  • PMMA 的酸性水解 (< 10%).
  • 用N-hydroxyphthalimide进行化,以引入热敏感触发剂.
  • 大量的PMMA同型聚合物和商业PMMA的脱聚合.
  • 用于创建可脱聚合的聚合物网络的应用.

主要成果:

  • 成功脱聚样PMMA同聚合物 (281140 kg/mol).
  • 实现了商业PMMA (Mn = 439 kg/mol) 的有效散装脱聚合.
  • 使用开发的方法证明了可脱聚合的聚合物网络的生成.

结论:

  • 报告的方法可使PMMA在低温下得到高效的脱聚合.
  • 这种方法对模型和商业PMMA都有效,表明其实际可用性.
  • 该方法显示了减少PMMA浪费和推进循环聚合物经济的潜力.