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Related Concept Videos

Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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.
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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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Anionic Chain-Growth Polymerization: Overview01:20

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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

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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.
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives.

Labeesh Kumar1, Sajan Singh2, Andriy Horechyy1

  • 1Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Str. 6, 01069 Dresden, Germany.

Membranes
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

Block copolymer (BCP) self-assembly enables advanced nano-catalyst fabrication. Researchers leverage BCP structures for diverse catalytic applications, including CNT growth and pollutant degradation.

Keywords:
block copolymercore-shellmicellesnano-catalystself-assemblyyolk-shell

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Catalysis

Background:

  • Block copolymer (BCP) self-assembly has been crucial for nano-catalyst development for over 20 years.
  • Various methods exist for BCP template-assisted nano-catalyst preparation.

Purpose of the Study:

  • Review advances in BCP self-assembled structures for nano-catalyst fabrication.
  • Highlight the exploitation of BCP features like periodicity and domain orientation.
  • Discuss the fabrication of diverse nano-catalyst architectures.

Main Methods:

  • Utilizing diblock, triblock, and other BCP self-assembled structures.
  • Employing fundamental approaches and combined simple methods.
  • Exploiting tunable periodicity, domain orientation, and lateral order.

Main Results:

  • Fabrication of catalysts for carbon nanotube growth.
  • Development of catalysts for CO electrooxidation, TIPB cracking, and alcohol oxidation.
  • Creation of catalysts for dye and pollutant degradation.
  • Synthesis of various nano-catalyst types: nanoparticle arrays, mesoporous structures, gyroid catalysts, and hollow fiber membranes.

Conclusions:

  • BCP self-assembly offers versatile strategies for efficient nano-catalyst design.
  • Tailoring BCP features leads to catalysts with specific functionalities.
  • This approach facilitates the creation of advanced catalytic materials for diverse applications.