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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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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: 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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Polymers02:34

Polymers

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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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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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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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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Controllable Supramolecular Polymerization Promoted by Host-Enhanced Photodimerization.

Yuetong Kang1, Zhengguo Cai1, Zehuan Huang1

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Researchers developed a controllable supramolecular polymerization method using host-enhanced photodimerization. This technique allows for tuning polymer molecular weight by adjusting UV irradiation time, offering new modulation strategies.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Photochemistry

Background:

  • Supramolecular polymerization offers a versatile platform for creating novel materials.
  • Controlling polymer properties like molecular weight is crucial for material applications.
  • Photodimerization is a known mechanism for polymer formation, but controllable methods are needed.

Purpose of the Study:

  • To introduce a novel method for controllable supramolecular polymerization.
  • To utilize host-enhanced photodimerization for polymer synthesis.
  • To demonstrate the tunability of supramolecular polymer molecular weight.

Main Methods:

  • Formation of low-molecular-weight supramolecular oligomers via noncovalent complexation between cucurbit[8]urils (CB[8]) and bifunctional monomers (DBN) bearing a Brooker's merocyanine moiety (MOED).
  • Transformation of supramolecular oligomers into high-molecular-weight supramolecular polymers upon UV light irradiation.
  • Control over the final molecular weight of supramolecular polymers by varying the UV irradiation time.

Main Results:

  • Successful synthesis of supramolecular polymers through a host-enhanced photodimerization process.
  • Demonstration that UV irradiation time directly correlates with the molecular weight of the resulting supramolecular polymers.
  • Achieved controllable supramolecular polymerization, enabling precise tuning of polymer characteristics.

Conclusions:

  • The developed method provides a new route for controllable supramolecular polymerization.
  • Host-enhanced photodimerization is an effective strategy for modulating supramolecular polymer formation.
  • This work expands the toolkit for designing and synthesizing advanced supramolecular materials.