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Olefin Metathesis Polymerization: Overview01:13

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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.
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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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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Covalent Organic Frameworks as a Platform for Multidimensional Polymerization.

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Covalent organic frameworks (COFs) are advanced polymers with diverse applications. Improved understanding of COF nucleation and growth is crucial for enhanced material quality and synthetic efficiency.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) are periodic polymer networks formed by simultaneous polymerization and crystallization.
  • COFs exhibit robust covalent bonds in 2D or 3D topologies.
  • Current COF properties are promising for catalysis, energy storage, photovoltaics, and proton-conducting membranes.

Purpose of the Study:

  • To address limitations in current synthetic methods for COFs.
  • To improve material quality, morphological control, and synthetic efficiency of COFs.
  • To foster fundamental understanding of COF nucleation and growth processes.

Main Methods:

  • Investigating COF nucleation and growth mechanisms.
  • Developing advanced characterization techniques for COF structure and defects.
  • Exploring improved synthetic strategies guided by mechanistic insights.

Main Results:

  • Current synthetic methods limit the quality, morphology, and efficiency of COF production.
  • Enhanced understanding of COF formation is essential for overcoming these limitations.
  • Accessing diverse isolated COF forms (crystals, films, suspensions) is a key challenge.

Conclusions:

  • Further research into COF nucleation and growth is critical for realizing their full application potential.
  • Advanced characterization and mechanistic understanding will drive improved COF syntheses.
  • Developing methods to control COF morphology and isolation is a significant frontier.