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Related Concept Videos

Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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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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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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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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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Related Experiment Video

Updated: Oct 6, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Pillar[5]arene-Integrated Three-Dimensional Framework Polymers for Macrocycle-Induced Size-Selective Catalysis.

Shang Lan1,2, Li Ling2, Shuyi Wang2

  • 1School of Pharmaceutical and Materials Engineering & Institute for Advanced Studies, Taizhou University, 1139 Shifu Avenue, Jiaojiang 318000, Zhejiang, China.

ACS Applied Materials & Interfaces
|January 17, 2022
PubMed
Summary

Porous organic polymers with pillar[5]arene hosts enable size-selective catalysis for chemical reactions. This host-guest interaction mechanism offers a new pathway for efficient and selective chemical transformations.

Keywords:
heterogeneous catalysishost−guest chemistryporous organic polymerssize-selective catalysisthree-dimensional framework

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Area of Science:

  • Materials Science
  • Catalysis
  • Supramolecular Chemistry

Background:

  • Size-selective catalysis is crucial for converting feedstocks like crude oil and biomass.
  • Porous organic polymers (POPs) offer high surface area and tunable properties for catalytic applications.

Purpose of the Study:

  • To develop novel porous organic polymers with integrated macrocycles for size-selective catalysis.
  • To investigate the catalytic performance and mechanism of these materials in Knoevenagel condensation reactions.

Main Methods:

  • Fabrication of three-dimensional pillar[5]arene-integrated porous organic polymers using 3D cross-linkers.
  • Evaluation of catalytic activity and selectivity in Knoevenagel condensation.
  • Mechanistic studies to elucidate the role of host-guest interactions.

Main Results:

  • The synthesized polymers exhibited a high surface-to-mass ratio.
  • Exceptional size-selective catalysis was observed in Knoevenagel condensation reactions.
  • Mechanistic studies confirmed that host-guest interactions between pillar[5]arene and substrates govern the size selectivity.

Conclusions:

  • Pillar[5]arene-integrated POPs demonstrate significant potential for size-selective catalysis.
  • The host-guest interaction mechanism provides a rational design strategy for selective catalysts.
  • Macrocycle-containing polymers represent a promising class of materials for advanced catalytic applications.